Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 1 | |
Guido van Rossum | 6602099 | 1996-06-11 18:32:18 +0000 | [diff] [blame] | 2 | /* Posix threads interface */ |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 3 | |
Guido van Rossum | 6602099 | 1996-06-11 18:32:18 +0000 | [diff] [blame] | 4 | #include <stdlib.h> |
Guido van Rossum | 9e46e56 | 1998-10-07 16:39:47 +0000 | [diff] [blame] | 5 | #include <string.h> |
Martin v. Löwis | a7a76d3 | 2002-10-04 07:21:24 +0000 | [diff] [blame] | 6 | #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR) |
Jack Jansen | 7668957 | 2002-01-15 20:36:14 +0000 | [diff] [blame] | 7 | #define destructor xxdestructor |
| 8 | #endif |
Guido van Rossum | 6602099 | 1996-06-11 18:32:18 +0000 | [diff] [blame] | 9 | #include <pthread.h> |
Martin v. Löwis | a7a76d3 | 2002-10-04 07:21:24 +0000 | [diff] [blame] | 10 | #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR) |
Jack Jansen | 7668957 | 2002-01-15 20:36:14 +0000 | [diff] [blame] | 11 | #undef destructor |
| 12 | #endif |
Guido van Rossum | 8023099 | 2001-10-12 21:49:17 +0000 | [diff] [blame] | 13 | #include <signal.h> |
Martin v. Löwis | 42ab61e | 2002-03-17 17:19:00 +0000 | [diff] [blame] | 14 | |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 15 | /* The POSIX spec requires that use of pthread_attr_setstacksize |
| 16 | be conditional on _POSIX_THREAD_ATTR_STACKSIZE being defined. */ |
| 17 | #ifdef _POSIX_THREAD_ATTR_STACKSIZE |
| 18 | #ifndef THREAD_STACK_SIZE |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 19 | #define THREAD_STACK_SIZE 0 /* use default stack size */ |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 20 | #endif |
Ned Deily | 9a7c524 | 2011-05-28 00:19:56 -0700 | [diff] [blame] | 21 | |
Ned Deily | 7ca97d5 | 2012-03-13 11:18:18 -0700 | [diff] [blame] | 22 | /* The default stack size for new threads on OSX and BSD is small enough that |
| 23 | * we'll get hard crashes instead of 'maximum recursion depth exceeded' |
| 24 | * exceptions. |
| 25 | * |
| 26 | * The default stack sizes below are the empirically determined minimal stack |
| 27 | * sizes where a simple recursive function doesn't cause a hard crash. |
| 28 | */ |
| 29 | #if defined(__APPLE__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0 |
| 30 | #undef THREAD_STACK_SIZE |
| 31 | #define THREAD_STACK_SIZE 0x500000 |
| 32 | #endif |
| 33 | #if defined(__FreeBSD__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0 |
Ned Deily | 9a7c524 | 2011-05-28 00:19:56 -0700 | [diff] [blame] | 34 | #undef THREAD_STACK_SIZE |
| 35 | #define THREAD_STACK_SIZE 0x400000 |
| 36 | #endif |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 37 | /* for safety, ensure a viable minimum stacksize */ |
Victor Stinner | 8c663fd | 2017-11-08 14:44:44 -0800 | [diff] [blame] | 38 | #define THREAD_STACK_MIN 0x8000 /* 32 KiB */ |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 39 | #else /* !_POSIX_THREAD_ATTR_STACKSIZE */ |
| 40 | #ifdef THREAD_STACK_SIZE |
| 41 | #error "THREAD_STACK_SIZE defined but _POSIX_THREAD_ATTR_STACKSIZE undefined" |
| 42 | #endif |
| 43 | #endif |
| 44 | |
Martin v. Löwis | 42ab61e | 2002-03-17 17:19:00 +0000 | [diff] [blame] | 45 | /* The POSIX spec says that implementations supporting the sem_* |
| 46 | family of functions must indicate this by defining |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 47 | _POSIX_SEMAPHORES. */ |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 48 | #ifdef _POSIX_SEMAPHORES |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 49 | /* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so |
Martin v. Löwis | 8b8fb3d | 2005-03-28 12:34:20 +0000 | [diff] [blame] | 50 | we need to add 0 to make it work there as well. */ |
| 51 | #if (_POSIX_SEMAPHORES+0) == -1 |
Anthony Baxter | 19b2369 | 2005-03-16 04:15:07 +0000 | [diff] [blame] | 52 | #define HAVE_BROKEN_POSIX_SEMAPHORES |
| 53 | #else |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 54 | #include <semaphore.h> |
| 55 | #include <errno.h> |
| 56 | #endif |
Anthony Baxter | 19b2369 | 2005-03-16 04:15:07 +0000 | [diff] [blame] | 57 | #endif |
Guido van Rossum | 6602099 | 1996-06-11 18:32:18 +0000 | [diff] [blame] | 58 | |
Guido van Rossum | d6353e2 | 1997-05-13 17:51:13 +0000 | [diff] [blame] | 59 | |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 60 | /* Whether or not to use semaphores directly rather than emulating them with |
| 61 | * mutexes and condition variables: |
| 62 | */ |
Antoine Pitrou | 19f8edc | 2010-10-10 08:37:22 +0000 | [diff] [blame] | 63 | #if (defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES) && \ |
| 64 | defined(HAVE_SEM_TIMEDWAIT)) |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 65 | # define USE_SEMAPHORES |
| 66 | #else |
| 67 | # undef USE_SEMAPHORES |
| 68 | #endif |
| 69 | |
| 70 | |
Guido van Rossum | 8023099 | 2001-10-12 21:49:17 +0000 | [diff] [blame] | 71 | /* On platforms that don't use standard POSIX threads pthread_sigmask() |
| 72 | * isn't present. DEC threads uses sigprocmask() instead as do most |
| 73 | * other UNIX International compliant systems that don't have the full |
| 74 | * pthread implementation. |
| 75 | */ |
Jason Tishler | fac083d | 2003-07-22 15:20:49 +0000 | [diff] [blame] | 76 | #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK) |
Guido van Rossum | 8023099 | 2001-10-12 21:49:17 +0000 | [diff] [blame] | 77 | # define SET_THREAD_SIGMASK pthread_sigmask |
| 78 | #else |
| 79 | # define SET_THREAD_SIGMASK sigprocmask |
| 80 | #endif |
| 81 | |
| 82 | |
Antoine Pitrou | 7c3e577 | 2010-04-14 15:44:10 +0000 | [diff] [blame] | 83 | /* We assume all modern POSIX systems have gettimeofday() */ |
| 84 | #ifdef GETTIMEOFDAY_NO_TZ |
| 85 | #define GETTIMEOFDAY(ptv) gettimeofday(ptv) |
| 86 | #else |
| 87 | #define GETTIMEOFDAY(ptv) gettimeofday(ptv, (struct timezone *)NULL) |
| 88 | #endif |
| 89 | |
| 90 | #define MICROSECONDS_TO_TIMESPEC(microseconds, ts) \ |
| 91 | do { \ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 92 | struct timeval tv; \ |
| 93 | GETTIMEOFDAY(&tv); \ |
| 94 | tv.tv_usec += microseconds % 1000000; \ |
| 95 | tv.tv_sec += microseconds / 1000000; \ |
| 96 | tv.tv_sec += tv.tv_usec / 1000000; \ |
| 97 | tv.tv_usec %= 1000000; \ |
| 98 | ts.tv_sec = tv.tv_sec; \ |
| 99 | ts.tv_nsec = tv.tv_usec * 1000; \ |
Antoine Pitrou | 7c3e577 | 2010-04-14 15:44:10 +0000 | [diff] [blame] | 100 | } while(0) |
| 101 | |
| 102 | |
Inada Naoki | 001fee1 | 2019-02-20 10:00:09 +0900 | [diff] [blame] | 103 | /* |
| 104 | * pthread_cond support |
| 105 | */ |
| 106 | |
| 107 | #if defined(HAVE_PTHREAD_CONDATTR_SETCLOCK) && defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC) |
| 108 | // monotonic is supported statically. It doesn't mean it works on runtime. |
| 109 | #define CONDATTR_MONOTONIC |
| 110 | #endif |
| 111 | |
| 112 | // NULL when pthread_condattr_setclock(CLOCK_MONOTONIC) is not supported. |
| 113 | static pthread_condattr_t *condattr_monotonic = NULL; |
| 114 | |
| 115 | static void |
| 116 | init_condattr() |
| 117 | { |
| 118 | #ifdef CONDATTR_MONOTONIC |
| 119 | static pthread_condattr_t ca; |
| 120 | pthread_condattr_init(&ca); |
| 121 | if (pthread_condattr_setclock(&ca, CLOCK_MONOTONIC) == 0) { |
| 122 | condattr_monotonic = &ca; // Use monotonic clock |
| 123 | } |
| 124 | #endif |
| 125 | } |
| 126 | |
| 127 | int |
| 128 | _PyThread_cond_init(PyCOND_T *cond) |
| 129 | { |
| 130 | return pthread_cond_init(cond, condattr_monotonic); |
| 131 | } |
| 132 | |
| 133 | void |
| 134 | _PyThread_cond_after(long long us, struct timespec *abs) |
| 135 | { |
| 136 | #ifdef CONDATTR_MONOTONIC |
| 137 | if (condattr_monotonic) { |
| 138 | clock_gettime(CLOCK_MONOTONIC, abs); |
| 139 | abs->tv_sec += us / 1000000; |
| 140 | abs->tv_nsec += (us % 1000000) * 1000; |
| 141 | abs->tv_sec += abs->tv_nsec / 1000000000; |
| 142 | abs->tv_nsec %= 1000000000; |
| 143 | return; |
| 144 | } |
| 145 | #endif |
| 146 | |
| 147 | struct timespec ts; |
| 148 | MICROSECONDS_TO_TIMESPEC(us, ts); |
| 149 | *abs = ts; |
| 150 | } |
| 151 | |
| 152 | |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 153 | /* A pthread mutex isn't sufficient to model the Python lock type |
| 154 | * because, according to Draft 5 of the docs (P1003.4a/D5), both of the |
| 155 | * following are undefined: |
| 156 | * -> a thread tries to lock a mutex it already has locked |
| 157 | * -> a thread tries to unlock a mutex locked by a different thread |
| 158 | * pthread mutexes are designed for serializing threads over short pieces |
| 159 | * of code anyway, so wouldn't be an appropriate implementation of |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 160 | * Python's locks regardless. |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 161 | * |
| 162 | * The pthread_lock struct implements a Python lock as a "locked?" bit |
| 163 | * and a <condition, mutex> pair. In general, if the bit can be acquired |
| 164 | * instantly, it is, else the pair is used to block the thread until the |
| 165 | * bit is cleared. 9 May 1994 tim@ksr.com |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 166 | */ |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 167 | |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 168 | typedef struct { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 169 | char locked; /* 0=unlocked, 1=locked */ |
| 170 | /* a <cond, mutex> pair to handle an acquire of a locked lock */ |
| 171 | pthread_cond_t lock_released; |
| 172 | pthread_mutex_t mut; |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 173 | } pthread_lock; |
| 174 | |
Guido van Rossum | 9e46e56 | 1998-10-07 16:39:47 +0000 | [diff] [blame] | 175 | #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; } |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 176 | #define CHECK_STATUS_PTHREAD(name) if (status != 0) { fprintf(stderr, \ |
| 177 | "%s: %s\n", name, strerror(status)); error = 1; } |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 178 | |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 179 | /* |
| 180 | * Initialization. |
| 181 | */ |
Thomas Wouters | f70ef4f | 2000-07-22 18:47:25 +0000 | [diff] [blame] | 182 | static void |
| 183 | PyThread__init_thread(void) |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 184 | { |
Guido van Rossum | d21744a | 1998-09-10 03:04:40 +0000 | [diff] [blame] | 185 | #if defined(_AIX) && defined(__GNUC__) |
Antoine Pitrou | 9a00e0a | 2013-06-18 22:17:48 +0200 | [diff] [blame] | 186 | extern void pthread_init(void); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 187 | pthread_init(); |
Guido van Rossum | d21744a | 1998-09-10 03:04:40 +0000 | [diff] [blame] | 188 | #endif |
Inada Naoki | 001fee1 | 2019-02-20 10:00:09 +0900 | [diff] [blame] | 189 | init_condattr(); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Thread support. |
| 194 | */ |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 195 | |
Siddhesh Poyarekar | 9eea6ea | 2018-11-30 20:44:25 +0530 | [diff] [blame] | 196 | /* bpo-33015: pythread_callback struct and pythread_wrapper() cast |
| 197 | "void func(void *)" to "void* func(void *)": always return NULL. |
| 198 | |
| 199 | PyThread_start_new_thread() uses "void func(void *)" type, whereas |
| 200 | pthread_create() requires a void* return value. */ |
| 201 | typedef struct { |
| 202 | void (*func) (void *); |
| 203 | void *arg; |
| 204 | } pythread_callback; |
| 205 | |
| 206 | static void * |
| 207 | pythread_wrapper(void *arg) |
| 208 | { |
| 209 | /* copy func and func_arg and free the temporary structure */ |
| 210 | pythread_callback *callback = arg; |
| 211 | void (*func)(void *) = callback->func; |
| 212 | void *func_arg = callback->arg; |
| 213 | PyMem_RawFree(arg); |
| 214 | |
| 215 | func(func_arg); |
| 216 | return NULL; |
| 217 | } |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 218 | |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 219 | unsigned long |
Thomas Wouters | f70ef4f | 2000-07-22 18:47:25 +0000 | [diff] [blame] | 220 | PyThread_start_new_thread(void (*func)(void *), void *arg) |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 221 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 222 | pthread_t th; |
| 223 | int status; |
Guido van Rossum | d0b69ec | 2001-09-10 14:10:54 +0000 | [diff] [blame] | 224 | #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 225 | pthread_attr_t attrs; |
Jack Jansen | c51395d | 2001-08-29 15:24:53 +0000 | [diff] [blame] | 226 | #endif |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 227 | #if defined(THREAD_STACK_SIZE) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 228 | size_t tss; |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 229 | #endif |
| 230 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 231 | dprintf(("PyThread_start_new_thread called\n")); |
| 232 | if (!initialized) |
| 233 | PyThread_init_thread(); |
Guido van Rossum | d6353e2 | 1997-05-13 17:51:13 +0000 | [diff] [blame] | 234 | |
Guido van Rossum | d0b69ec | 2001-09-10 14:10:54 +0000 | [diff] [blame] | 235 | #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 236 | if (pthread_attr_init(&attrs) != 0) |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 237 | return PYTHREAD_INVALID_THREAD_ID; |
Guido van Rossum | d0b69ec | 2001-09-10 14:10:54 +0000 | [diff] [blame] | 238 | #endif |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 239 | #if defined(THREAD_STACK_SIZE) |
Victor Stinner | 50b4857 | 2018-11-01 01:51:40 +0100 | [diff] [blame] | 240 | PyThreadState *tstate = _PyThreadState_GET(); |
Eric Snow | 2ebc5ce | 2017-09-07 23:51:28 -0600 | [diff] [blame] | 241 | size_t stacksize = tstate ? tstate->interp->pythread_stacksize : 0; |
| 242 | tss = (stacksize != 0) ? stacksize : THREAD_STACK_SIZE; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 243 | if (tss != 0) { |
| 244 | if (pthread_attr_setstacksize(&attrs, tss) != 0) { |
| 245 | pthread_attr_destroy(&attrs); |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 246 | return PYTHREAD_INVALID_THREAD_ID; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 247 | } |
| 248 | } |
Jack Jansen | c51395d | 2001-08-29 15:24:53 +0000 | [diff] [blame] | 249 | #endif |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 250 | #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 251 | pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM); |
Guido van Rossum | d0b69ec | 2001-09-10 14:10:54 +0000 | [diff] [blame] | 252 | #endif |
Guido van Rossum | 8023099 | 2001-10-12 21:49:17 +0000 | [diff] [blame] | 253 | |
Siddhesh Poyarekar | 9eea6ea | 2018-11-30 20:44:25 +0530 | [diff] [blame] | 254 | pythread_callback *callback = PyMem_RawMalloc(sizeof(pythread_callback)); |
| 255 | |
| 256 | if (callback == NULL) { |
| 257 | return PYTHREAD_INVALID_THREAD_ID; |
| 258 | } |
| 259 | |
| 260 | callback->func = func; |
| 261 | callback->arg = arg; |
| 262 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 263 | status = pthread_create(&th, |
Guido van Rossum | d0b69ec | 2001-09-10 14:10:54 +0000 | [diff] [blame] | 264 | #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 265 | &attrs, |
Jack Jansen | c51395d | 2001-08-29 15:24:53 +0000 | [diff] [blame] | 266 | #else |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 267 | (pthread_attr_t*)NULL, |
Jack Jansen | c51395d | 2001-08-29 15:24:53 +0000 | [diff] [blame] | 268 | #endif |
Siddhesh Poyarekar | 9eea6ea | 2018-11-30 20:44:25 +0530 | [diff] [blame] | 269 | pythread_wrapper, callback); |
Guido van Rossum | 8023099 | 2001-10-12 21:49:17 +0000 | [diff] [blame] | 270 | |
Fred Drake | 03459a5 | 2001-11-09 16:00:41 +0000 | [diff] [blame] | 271 | #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 272 | pthread_attr_destroy(&attrs); |
Jack Jansen | c51395d | 2001-08-29 15:24:53 +0000 | [diff] [blame] | 273 | #endif |
Siddhesh Poyarekar | 9eea6ea | 2018-11-30 20:44:25 +0530 | [diff] [blame] | 274 | |
| 275 | if (status != 0) { |
| 276 | PyMem_RawFree(callback); |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 277 | return PYTHREAD_INVALID_THREAD_ID; |
Siddhesh Poyarekar | 9eea6ea | 2018-11-30 20:44:25 +0530 | [diff] [blame] | 278 | } |
Martin v. Löwis | 910ae62 | 2003-04-19 07:44:52 +0000 | [diff] [blame] | 279 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 280 | pthread_detach(th); |
Martin v. Löwis | 910ae62 | 2003-04-19 07:44:52 +0000 | [diff] [blame] | 281 | |
Guido van Rossum | 3c28863 | 2001-10-16 21:13:49 +0000 | [diff] [blame] | 282 | #if SIZEOF_PTHREAD_T <= SIZEOF_LONG |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 283 | return (unsigned long) th; |
Guido van Rossum | 3c28863 | 2001-10-16 21:13:49 +0000 | [diff] [blame] | 284 | #else |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 285 | return (unsigned long) *(unsigned long *) &th; |
Guido van Rossum | 3c28863 | 2001-10-16 21:13:49 +0000 | [diff] [blame] | 286 | #endif |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 287 | } |
| 288 | |
Trent Mick | 635f6fb | 2000-08-23 21:33:05 +0000 | [diff] [blame] | 289 | /* XXX This implementation is considered (to quote Tim Peters) "inherently |
| 290 | hosed" because: |
Skip Montanaro | 6babcc2 | 2004-03-03 08:42:23 +0000 | [diff] [blame] | 291 | - It does not guarantee the promise that a non-zero integer is returned. |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 292 | - The cast to unsigned long is inherently unsafe. |
Jesus Cea | 736e7fc | 2011-03-14 17:36:54 +0100 | [diff] [blame] | 293 | - It is not clear that the 'volatile' (for AIX?) are any longer necessary. |
Trent Mick | 635f6fb | 2000-08-23 21:33:05 +0000 | [diff] [blame] | 294 | */ |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 295 | unsigned long |
Thomas Wouters | f70ef4f | 2000-07-22 18:47:25 +0000 | [diff] [blame] | 296 | PyThread_get_thread_ident(void) |
Guido van Rossum | e944da8 | 1994-05-23 12:43:41 +0000 | [diff] [blame] | 297 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 298 | volatile pthread_t threadid; |
| 299 | if (!initialized) |
| 300 | PyThread_init_thread(); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 301 | threadid = pthread_self(); |
Serhiy Storchaka | aefa7eb | 2017-03-23 15:48:39 +0200 | [diff] [blame] | 302 | return (unsigned long) threadid; |
Guido van Rossum | e944da8 | 1994-05-23 12:43:41 +0000 | [diff] [blame] | 303 | } |
| 304 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 305 | void |
Thomas Wouters | f70ef4f | 2000-07-22 18:47:25 +0000 | [diff] [blame] | 306 | PyThread_exit_thread(void) |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 307 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 308 | dprintf(("PyThread_exit_thread called\n")); |
Antoine Pitrou | 0d5e52d | 2011-05-04 20:02:30 +0200 | [diff] [blame] | 309 | if (!initialized) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 310 | exit(0); |
Antoine Pitrou | 0d5e52d | 2011-05-04 20:02:30 +0200 | [diff] [blame] | 311 | pthread_exit(0); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 312 | } |
| 313 | |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 314 | #ifdef USE_SEMAPHORES |
| 315 | |
| 316 | /* |
| 317 | * Lock support. |
| 318 | */ |
| 319 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 320 | PyThread_type_lock |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 321 | PyThread_allocate_lock(void) |
| 322 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 323 | sem_t *lock; |
| 324 | int status, error = 0; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 325 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 326 | dprintf(("PyThread_allocate_lock called\n")); |
| 327 | if (!initialized) |
| 328 | PyThread_init_thread(); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 329 | |
Victor Stinner | 80aa565 | 2013-07-07 17:17:59 +0200 | [diff] [blame] | 330 | lock = (sem_t *)PyMem_RawMalloc(sizeof(sem_t)); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 331 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 332 | if (lock) { |
| 333 | status = sem_init(lock,0,1); |
| 334 | CHECK_STATUS("sem_init"); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 335 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 336 | if (error) { |
Victor Stinner | 80aa565 | 2013-07-07 17:17:59 +0200 | [diff] [blame] | 337 | PyMem_RawFree((void *)lock); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 338 | lock = NULL; |
| 339 | } |
| 340 | } |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 341 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 342 | dprintf(("PyThread_allocate_lock() -> %p\n", lock)); |
| 343 | return (PyThread_type_lock)lock; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 344 | } |
| 345 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 346 | void |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 347 | PyThread_free_lock(PyThread_type_lock lock) |
| 348 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 349 | sem_t *thelock = (sem_t *)lock; |
| 350 | int status, error = 0; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 351 | |
Christian Heimes | 56379c0 | 2012-12-02 08:37:00 +0100 | [diff] [blame] | 352 | (void) error; /* silence unused-but-set-variable warning */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 353 | dprintf(("PyThread_free_lock(%p) called\n", lock)); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 354 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 355 | if (!thelock) |
| 356 | return; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 357 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 358 | status = sem_destroy(thelock); |
| 359 | CHECK_STATUS("sem_destroy"); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 360 | |
Victor Stinner | 80aa565 | 2013-07-07 17:17:59 +0200 | [diff] [blame] | 361 | PyMem_RawFree((void *)thelock); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | /* |
| 365 | * As of February 2002, Cygwin thread implementations mistakenly report error |
| 366 | * codes in the return value of the sem_ calls (like the pthread_ functions). |
| 367 | * Correct implementations return -1 and put the code in errno. This supports |
| 368 | * either. |
| 369 | */ |
| 370 | static int |
| 371 | fix_status(int status) |
| 372 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 373 | return (status == -1) ? errno : status; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 374 | } |
| 375 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 376 | PyLockStatus |
| 377 | PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds, |
| 378 | int intr_flag) |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 379 | { |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 380 | PyLockStatus success; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 381 | sem_t *thelock = (sem_t *)lock; |
| 382 | int status, error = 0; |
| 383 | struct timespec ts; |
Victor Stinner | 850a18e | 2017-10-24 16:53:32 -0700 | [diff] [blame] | 384 | _PyTime_t deadline = 0; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 385 | |
Christian Heimes | 56379c0 | 2012-12-02 08:37:00 +0100 | [diff] [blame] | 386 | (void) error; /* silence unused-but-set-variable warning */ |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 387 | dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) called\n", |
| 388 | lock, microseconds, intr_flag)); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 389 | |
Victor Stinner | 850a18e | 2017-10-24 16:53:32 -0700 | [diff] [blame] | 390 | if (microseconds > PY_TIMEOUT_MAX) { |
| 391 | Py_FatalError("Timeout larger than PY_TIMEOUT_MAX"); |
| 392 | } |
| 393 | |
| 394 | if (microseconds > 0) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 395 | MICROSECONDS_TO_TIMESPEC(microseconds, ts); |
Victor Stinner | 850a18e | 2017-10-24 16:53:32 -0700 | [diff] [blame] | 396 | |
| 397 | if (!intr_flag) { |
| 398 | /* cannot overflow thanks to (microseconds > PY_TIMEOUT_MAX) |
| 399 | check done above */ |
| 400 | _PyTime_t timeout = _PyTime_FromNanoseconds(microseconds * 1000); |
| 401 | deadline = _PyTime_GetMonotonicClock() + timeout; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | while (1) { |
| 406 | if (microseconds > 0) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 407 | status = fix_status(sem_timedwait(thelock, &ts)); |
Victor Stinner | 850a18e | 2017-10-24 16:53:32 -0700 | [diff] [blame] | 408 | } |
| 409 | else if (microseconds == 0) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 410 | status = fix_status(sem_trywait(thelock)); |
Victor Stinner | 850a18e | 2017-10-24 16:53:32 -0700 | [diff] [blame] | 411 | } |
| 412 | else { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 413 | status = fix_status(sem_wait(thelock)); |
Victor Stinner | 850a18e | 2017-10-24 16:53:32 -0700 | [diff] [blame] | 414 | } |
| 415 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 416 | /* Retry if interrupted by a signal, unless the caller wants to be |
| 417 | notified. */ |
Victor Stinner | 850a18e | 2017-10-24 16:53:32 -0700 | [diff] [blame] | 418 | if (intr_flag || status != EINTR) { |
| 419 | break; |
| 420 | } |
| 421 | |
| 422 | if (microseconds > 0) { |
| 423 | /* wait interrupted by a signal (EINTR): recompute the timeout */ |
| 424 | _PyTime_t dt = deadline - _PyTime_GetMonotonicClock(); |
| 425 | if (dt < 0) { |
| 426 | status = ETIMEDOUT; |
| 427 | break; |
| 428 | } |
| 429 | else if (dt > 0) { |
| 430 | _PyTime_t realtime_deadline = _PyTime_GetSystemClock() + dt; |
| 431 | if (_PyTime_AsTimespec(realtime_deadline, &ts) < 0) { |
| 432 | /* Cannot occur thanks to (microseconds > PY_TIMEOUT_MAX) |
| 433 | check done above */ |
| 434 | Py_UNREACHABLE(); |
| 435 | } |
| 436 | /* no need to update microseconds value, the code only care |
| 437 | if (microseconds > 0 or (microseconds == 0). */ |
| 438 | } |
| 439 | else { |
| 440 | microseconds = 0; |
| 441 | } |
| 442 | } |
| 443 | } |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 444 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 445 | /* Don't check the status if we're stopping because of an interrupt. */ |
| 446 | if (!(intr_flag && status == EINTR)) { |
| 447 | if (microseconds > 0) { |
| 448 | if (status != ETIMEDOUT) |
| 449 | CHECK_STATUS("sem_timedwait"); |
| 450 | } |
| 451 | else if (microseconds == 0) { |
| 452 | if (status != EAGAIN) |
| 453 | CHECK_STATUS("sem_trywait"); |
| 454 | } |
| 455 | else { |
| 456 | CHECK_STATUS("sem_wait"); |
| 457 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 458 | } |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 459 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 460 | if (status == 0) { |
| 461 | success = PY_LOCK_ACQUIRED; |
| 462 | } else if (intr_flag && status == EINTR) { |
| 463 | success = PY_LOCK_INTR; |
| 464 | } else { |
| 465 | success = PY_LOCK_FAILURE; |
| 466 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 467 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 468 | dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) -> %d\n", |
| 469 | lock, microseconds, intr_flag, success)); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 470 | return success; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 471 | } |
| 472 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 473 | void |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 474 | PyThread_release_lock(PyThread_type_lock lock) |
| 475 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 476 | sem_t *thelock = (sem_t *)lock; |
| 477 | int status, error = 0; |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 478 | |
Christian Heimes | 56379c0 | 2012-12-02 08:37:00 +0100 | [diff] [blame] | 479 | (void) error; /* silence unused-but-set-variable warning */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 480 | dprintf(("PyThread_release_lock(%p) called\n", lock)); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 481 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 482 | status = sem_post(thelock); |
| 483 | CHECK_STATUS("sem_post"); |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | #else /* USE_SEMAPHORES */ |
| 487 | |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 488 | /* |
| 489 | * Lock support. |
| 490 | */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 491 | PyThread_type_lock |
Thomas Wouters | f70ef4f | 2000-07-22 18:47:25 +0000 | [diff] [blame] | 492 | PyThread_allocate_lock(void) |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 493 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 494 | pthread_lock *lock; |
| 495 | int status, error = 0; |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 496 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 497 | dprintf(("PyThread_allocate_lock called\n")); |
| 498 | if (!initialized) |
| 499 | PyThread_init_thread(); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 500 | |
Victor Stinner | 80aa565 | 2013-07-07 17:17:59 +0200 | [diff] [blame] | 501 | lock = (pthread_lock *) PyMem_RawMalloc(sizeof(pthread_lock)); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 502 | if (lock) { |
| 503 | memset((void *)lock, '\0', sizeof(pthread_lock)); |
| 504 | lock->locked = 0; |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 505 | |
Inada Naoki | 001fee1 | 2019-02-20 10:00:09 +0900 | [diff] [blame] | 506 | status = pthread_mutex_init(&lock->mut, NULL); |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 507 | CHECK_STATUS_PTHREAD("pthread_mutex_init"); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 508 | /* Mark the pthread mutex underlying a Python mutex as |
| 509 | pure happens-before. We can't simply mark the |
| 510 | Python-level mutex as a mutex because it can be |
| 511 | acquired and released in different threads, which |
| 512 | will cause errors. */ |
| 513 | _Py_ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX(&lock->mut); |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 514 | |
Inada Naoki | 001fee1 | 2019-02-20 10:00:09 +0900 | [diff] [blame] | 515 | status = _PyThread_cond_init(&lock->lock_released); |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 516 | CHECK_STATUS_PTHREAD("pthread_cond_init"); |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 517 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 518 | if (error) { |
Victor Stinner | 80aa565 | 2013-07-07 17:17:59 +0200 | [diff] [blame] | 519 | PyMem_RawFree((void *)lock); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 520 | lock = 0; |
| 521 | } |
| 522 | } |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 523 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 524 | dprintf(("PyThread_allocate_lock() -> %p\n", lock)); |
| 525 | return (PyThread_type_lock) lock; |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 526 | } |
| 527 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 528 | void |
Thomas Wouters | f70ef4f | 2000-07-22 18:47:25 +0000 | [diff] [blame] | 529 | PyThread_free_lock(PyThread_type_lock lock) |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 530 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 531 | pthread_lock *thelock = (pthread_lock *)lock; |
| 532 | int status, error = 0; |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 533 | |
Antoine Pitrou | 9a00e0a | 2013-06-18 22:17:48 +0200 | [diff] [blame] | 534 | (void) error; /* silence unused-but-set-variable warning */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 535 | dprintf(("PyThread_free_lock(%p) called\n", lock)); |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 536 | |
Kristján Valur Jónsson | 187aa54 | 2012-06-05 22:17:42 +0000 | [diff] [blame] | 537 | /* some pthread-like implementations tie the mutex to the cond |
| 538 | * and must have the cond destroyed first. |
| 539 | */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 540 | status = pthread_cond_destroy( &thelock->lock_released ); |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 541 | CHECK_STATUS_PTHREAD("pthread_cond_destroy"); |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 542 | |
Kristján Valur Jónsson | 187aa54 | 2012-06-05 22:17:42 +0000 | [diff] [blame] | 543 | status = pthread_mutex_destroy( &thelock->mut ); |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 544 | CHECK_STATUS_PTHREAD("pthread_mutex_destroy"); |
Kristján Valur Jónsson | 187aa54 | 2012-06-05 22:17:42 +0000 | [diff] [blame] | 545 | |
Victor Stinner | 80aa565 | 2013-07-07 17:17:59 +0200 | [diff] [blame] | 546 | PyMem_RawFree((void *)thelock); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 547 | } |
| 548 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 549 | PyLockStatus |
| 550 | PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds, |
| 551 | int intr_flag) |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 552 | { |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 553 | PyLockStatus success = PY_LOCK_FAILURE; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 554 | pthread_lock *thelock = (pthread_lock *)lock; |
| 555 | int status, error = 0; |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 556 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 557 | dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) called\n", |
| 558 | lock, microseconds, intr_flag)); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 559 | |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 560 | if (microseconds == 0) { |
| 561 | status = pthread_mutex_trylock( &thelock->mut ); |
| 562 | if (status != EBUSY) |
| 563 | CHECK_STATUS_PTHREAD("pthread_mutex_trylock[1]"); |
| 564 | } |
| 565 | else { |
| 566 | status = pthread_mutex_lock( &thelock->mut ); |
| 567 | CHECK_STATUS_PTHREAD("pthread_mutex_lock[1]"); |
| 568 | } |
| 569 | if (status == 0) { |
| 570 | if (thelock->locked == 0) { |
| 571 | success = PY_LOCK_ACQUIRED; |
| 572 | } |
| 573 | else if (microseconds != 0) { |
Inada Naoki | 001fee1 | 2019-02-20 10:00:09 +0900 | [diff] [blame] | 574 | struct timespec abs; |
| 575 | if (microseconds > 0) { |
| 576 | _PyThread_cond_after(microseconds, &abs); |
| 577 | } |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 578 | /* continue trying until we get the lock */ |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 579 | |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 580 | /* mut must be locked by me -- part of the condition |
| 581 | * protocol */ |
| 582 | while (success == PY_LOCK_FAILURE) { |
| 583 | if (microseconds > 0) { |
| 584 | status = pthread_cond_timedwait( |
| 585 | &thelock->lock_released, |
Inada Naoki | 001fee1 | 2019-02-20 10:00:09 +0900 | [diff] [blame] | 586 | &thelock->mut, &abs); |
| 587 | if (status == 1) { |
| 588 | break; |
| 589 | } |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 590 | if (status == ETIMEDOUT) |
| 591 | break; |
Inada Naoki | 001fee1 | 2019-02-20 10:00:09 +0900 | [diff] [blame] | 592 | CHECK_STATUS_PTHREAD("pthread_cond_timedwait"); |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 593 | } |
| 594 | else { |
| 595 | status = pthread_cond_wait( |
| 596 | &thelock->lock_released, |
| 597 | &thelock->mut); |
| 598 | CHECK_STATUS_PTHREAD("pthread_cond_wait"); |
| 599 | } |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 600 | |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 601 | if (intr_flag && status == 0 && thelock->locked) { |
| 602 | /* We were woken up, but didn't get the lock. We probably received |
| 603 | * a signal. Return PY_LOCK_INTR to allow the caller to handle |
| 604 | * it and retry. */ |
| 605 | success = PY_LOCK_INTR; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 606 | break; |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 607 | } |
| 608 | else if (status == 0 && !thelock->locked) { |
| 609 | success = PY_LOCK_ACQUIRED; |
| 610 | } |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 611 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 612 | } |
Antoine Pitrou | f84ac42 | 2017-06-26 20:41:07 +0200 | [diff] [blame] | 613 | if (success == PY_LOCK_ACQUIRED) thelock->locked = 1; |
| 614 | status = pthread_mutex_unlock( &thelock->mut ); |
| 615 | CHECK_STATUS_PTHREAD("pthread_mutex_unlock[1]"); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 616 | } |
Martin v. Löwis | 1509a15 | 2003-04-18 11:11:09 +0000 | [diff] [blame] | 617 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 618 | if (error) success = PY_LOCK_FAILURE; |
| 619 | dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) -> %d\n", |
| 620 | lock, microseconds, intr_flag, success)); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 621 | return success; |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 622 | } |
| 623 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 624 | void |
Thomas Wouters | f70ef4f | 2000-07-22 18:47:25 +0000 | [diff] [blame] | 625 | PyThread_release_lock(PyThread_type_lock lock) |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 626 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 627 | pthread_lock *thelock = (pthread_lock *)lock; |
| 628 | int status, error = 0; |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 629 | |
Antoine Pitrou | 9a00e0a | 2013-06-18 22:17:48 +0200 | [diff] [blame] | 630 | (void) error; /* silence unused-but-set-variable warning */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 631 | dprintf(("PyThread_release_lock(%p) called\n", lock)); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 632 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 633 | status = pthread_mutex_lock( &thelock->mut ); |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 634 | CHECK_STATUS_PTHREAD("pthread_mutex_lock[3]"); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 635 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 636 | thelock->locked = 0; |
Guido van Rossum | b98b1b3 | 1994-05-11 08:42:04 +0000 | [diff] [blame] | 637 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 638 | /* wake up someone (anyone, if any) waiting on the lock */ |
| 639 | status = pthread_cond_signal( &thelock->lock_released ); |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 640 | CHECK_STATUS_PTHREAD("pthread_cond_signal"); |
Kristján Valur Jónsson | 187aa54 | 2012-06-05 22:17:42 +0000 | [diff] [blame] | 641 | |
| 642 | status = pthread_mutex_unlock( &thelock->mut ); |
Daniel Birnstiel | d7fa6b2 | 2017-03-21 14:06:06 +0100 | [diff] [blame] | 643 | CHECK_STATUS_PTHREAD("pthread_mutex_unlock[3]"); |
Guido van Rossum | 2c8cb9f | 1994-05-09 15:12:46 +0000 | [diff] [blame] | 644 | } |
Martin v. Löwis | cc89866 | 2002-03-17 09:53:51 +0000 | [diff] [blame] | 645 | |
| 646 | #endif /* USE_SEMAPHORES */ |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 647 | |
Antoine Pitrou | 810023d | 2010-12-15 22:59:16 +0000 | [diff] [blame] | 648 | int |
| 649 | PyThread_acquire_lock(PyThread_type_lock lock, int waitflag) |
| 650 | { |
| 651 | return PyThread_acquire_lock_timed(lock, waitflag ? -1 : 0, /*intr_flag=*/0); |
| 652 | } |
| 653 | |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 654 | /* set the thread stack size. |
| 655 | * Return 0 if size is valid, -1 if size is invalid, |
| 656 | * -2 if setting stack size is not supported. |
| 657 | */ |
| 658 | static int |
| 659 | _pythread_pthread_set_stacksize(size_t size) |
| 660 | { |
| 661 | #if defined(THREAD_STACK_SIZE) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 662 | pthread_attr_t attrs; |
| 663 | size_t tss_min; |
| 664 | int rc = 0; |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 665 | #endif |
| 666 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 667 | /* set to default */ |
| 668 | if (size == 0) { |
Victor Stinner | 50b4857 | 2018-11-01 01:51:40 +0100 | [diff] [blame] | 669 | _PyInterpreterState_GET_UNSAFE()->pythread_stacksize = 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 670 | return 0; |
| 671 | } |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 672 | |
| 673 | #if defined(THREAD_STACK_SIZE) |
| 674 | #if defined(PTHREAD_STACK_MIN) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 675 | tss_min = PTHREAD_STACK_MIN > THREAD_STACK_MIN ? PTHREAD_STACK_MIN |
| 676 | : THREAD_STACK_MIN; |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 677 | #else |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 678 | tss_min = THREAD_STACK_MIN; |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 679 | #endif |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 680 | if (size >= tss_min) { |
| 681 | /* validate stack size by setting thread attribute */ |
| 682 | if (pthread_attr_init(&attrs) == 0) { |
| 683 | rc = pthread_attr_setstacksize(&attrs, size); |
| 684 | pthread_attr_destroy(&attrs); |
| 685 | if (rc == 0) { |
Victor Stinner | 50b4857 | 2018-11-01 01:51:40 +0100 | [diff] [blame] | 686 | _PyInterpreterState_GET_UNSAFE()->pythread_stacksize = size; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 687 | return 0; |
| 688 | } |
| 689 | } |
| 690 | } |
| 691 | return -1; |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 692 | #else |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 693 | return -2; |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 694 | #endif |
| 695 | } |
| 696 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 697 | #define THREAD_SET_STACKSIZE(x) _pythread_pthread_set_stacksize(x) |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 698 | |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 699 | |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 700 | /* Thread Local Storage (TLS) API |
| 701 | |
| 702 | This API is DEPRECATED since Python 3.7. See PEP 539 for details. |
| 703 | */ |
| 704 | |
| 705 | /* Issue #25658: On platforms where native TLS key is defined in a way that |
| 706 | cannot be safely cast to int, PyThread_create_key returns immediately a |
| 707 | failure status and other TLS functions all are no-ops. This indicates |
| 708 | clearly that the old API is not supported on platforms where it cannot be |
| 709 | used reliably, and that no effort will be made to add such support. |
| 710 | |
| 711 | Note: PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT will be unnecessary after |
| 712 | removing this API. |
| 713 | */ |
| 714 | |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 715 | int |
| 716 | PyThread_create_key(void) |
| 717 | { |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 718 | #ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 719 | pthread_key_t key; |
| 720 | int fail = pthread_key_create(&key, NULL); |
Victor Stinner | daca3d7 | 2014-08-17 22:11:06 +0200 | [diff] [blame] | 721 | if (fail) |
| 722 | return -1; |
| 723 | if (key > INT_MAX) { |
| 724 | /* Issue #22206: handle integer overflow */ |
| 725 | pthread_key_delete(key); |
| 726 | errno = ENOMEM; |
| 727 | return -1; |
| 728 | } |
| 729 | return (int)key; |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 730 | #else |
| 731 | return -1; /* never return valid key value. */ |
| 732 | #endif |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | void |
| 736 | PyThread_delete_key(int key) |
| 737 | { |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 738 | #ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 739 | pthread_key_delete(key); |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 740 | #endif |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | void |
| 744 | PyThread_delete_key_value(int key) |
| 745 | { |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 746 | #ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 747 | pthread_setspecific(key, NULL); |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 748 | #endif |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | int |
| 752 | PyThread_set_key_value(int key, void *value) |
| 753 | { |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 754 | #ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT |
| 755 | int fail = pthread_setspecific(key, value); |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 756 | return fail ? -1 : 0; |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 757 | #else |
| 758 | return -1; |
| 759 | #endif |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | void * |
| 763 | PyThread_get_key_value(int key) |
| 764 | { |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 765 | #ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 766 | return pthread_getspecific(key); |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 767 | #else |
| 768 | return NULL; |
| 769 | #endif |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 770 | } |
| 771 | |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 772 | |
Kristján Valur Jónsson | 2fea9b9 | 2010-09-20 02:11:49 +0000 | [diff] [blame] | 773 | void |
| 774 | PyThread_ReInitTLS(void) |
Masayuki Yamamoto | 731e189 | 2017-10-06 19:41:34 +0900 | [diff] [blame] | 775 | { |
| 776 | } |
| 777 | |
| 778 | |
| 779 | /* Thread Specific Storage (TSS) API |
| 780 | |
| 781 | Platform-specific components of TSS API implementation. |
| 782 | */ |
| 783 | |
| 784 | int |
| 785 | PyThread_tss_create(Py_tss_t *key) |
| 786 | { |
| 787 | assert(key != NULL); |
| 788 | /* If the key has been created, function is silently skipped. */ |
| 789 | if (key->_is_initialized) { |
| 790 | return 0; |
| 791 | } |
| 792 | |
| 793 | int fail = pthread_key_create(&(key->_key), NULL); |
| 794 | if (fail) { |
| 795 | return -1; |
| 796 | } |
| 797 | key->_is_initialized = 1; |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | void |
| 802 | PyThread_tss_delete(Py_tss_t *key) |
| 803 | { |
| 804 | assert(key != NULL); |
| 805 | /* If the key has not been created, function is silently skipped. */ |
| 806 | if (!key->_is_initialized) { |
| 807 | return; |
| 808 | } |
| 809 | |
| 810 | pthread_key_delete(key->_key); |
| 811 | /* pthread has not provided the defined invalid value for the key. */ |
| 812 | key->_is_initialized = 0; |
| 813 | } |
| 814 | |
| 815 | int |
| 816 | PyThread_tss_set(Py_tss_t *key, void *value) |
| 817 | { |
| 818 | assert(key != NULL); |
| 819 | int fail = pthread_setspecific(key->_key, value); |
| 820 | return fail ? -1 : 0; |
| 821 | } |
| 822 | |
| 823 | void * |
| 824 | PyThread_tss_get(Py_tss_t *key) |
| 825 | { |
| 826 | assert(key != NULL); |
| 827 | return pthread_getspecific(key->_key); |
| 828 | } |