sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 1 | /* |
| 2 | This file is part of drd, a data race detector. |
| 3 | |
| 4 | Copyright (C) 2006-2008 Bart Van Assche |
| 5 | bart.vanassche@gmail.com |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or |
| 8 | modify it under the terms of the GNU General Public License as |
| 9 | published by the Free Software Foundation; either version 2 of the |
| 10 | License, or (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, but |
| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 20 | 02111-1307, USA. |
| 21 | |
| 22 | The GNU General Public License is contained in the file COPYING. |
| 23 | */ |
| 24 | |
| 25 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 26 | #include "drd_clientobj.h" |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 27 | #include "drd_error.h" |
| 28 | #include "drd_semaphore.h" |
| 29 | #include "drd_suppression.h" |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 30 | #include "pub_tool_errormgr.h" // VG_(maybe_record_error)() |
| 31 | #include "pub_tool_libcassert.h" // tl_assert() |
| 32 | #include "pub_tool_libcprint.h" // VG_(printf)() |
| 33 | #include "pub_tool_machine.h" // VG_(get_IP)() |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 34 | #include "pub_tool_mallocfree.h" // VG_(malloc), VG_(free) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 35 | #include "pub_tool_threadstate.h" // VG_(get_running_tid)() |
| 36 | |
| 37 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 38 | // Local functions. |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 39 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 40 | static void semaphore_cleanup(struct semaphore_info* p); |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 41 | |
| 42 | |
| 43 | // Local variables. |
| 44 | |
| 45 | static Bool s_trace_semaphore; |
bart | 6bbefaf | 2008-04-19 15:16:45 +0000 | [diff] [blame] | 46 | static ULong s_semaphore_segment_creation_count; |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 47 | |
| 48 | |
| 49 | // Function definitions. |
| 50 | |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 51 | static void segment_push(struct semaphore_info* p, Segment* sg) |
| 52 | { |
| 53 | Word n; |
| 54 | |
| 55 | tl_assert(sg); |
| 56 | n = VG_(addToXA)(p->last_sem_post_seg, &sg); |
| 57 | #if 0 |
| 58 | VG_(message)(Vg_UserMsg, "0x%lx push: added at position %ld/%ld", |
| 59 | p->a1, n, VG_(sizeXA)(p->last_sem_post_seg)); |
| 60 | #endif |
| 61 | tl_assert(*(Segment**)VG_(indexXA)(p->last_sem_post_seg, n) == sg); |
| 62 | } |
| 63 | |
| 64 | static Segment* segment_pop(struct semaphore_info* p) |
| 65 | { |
| 66 | Word sz; |
| 67 | Segment* sg; |
| 68 | |
| 69 | sz = VG_(sizeXA)(p->last_sem_post_seg); |
| 70 | #if 0 |
| 71 | VG_(message)(Vg_UserMsg, "0x%lx pop: removed from position %ld/%ld", |
| 72 | p->a1, sz - 1, sz); |
| 73 | #endif |
| 74 | sg = 0; |
| 75 | if (sz > 0) |
| 76 | { |
| 77 | sg = *(Segment**)VG_(indexXA)(p->last_sem_post_seg, sz - 1); |
| 78 | tl_assert(sg); |
| 79 | VG_(dropTailXA)(p->last_sem_post_seg, 1); |
| 80 | } |
| 81 | return sg; |
| 82 | } |
| 83 | |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 84 | void semaphore_set_trace(const Bool trace_semaphore) |
| 85 | { |
| 86 | s_trace_semaphore = trace_semaphore; |
| 87 | } |
| 88 | |
| 89 | static |
| 90 | void semaphore_initialize(struct semaphore_info* const p, |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 91 | const Addr semaphore, const UWord value) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 92 | { |
| 93 | tl_assert(semaphore != 0); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 94 | tl_assert(p->a1 == semaphore); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 95 | tl_assert(p->type == ClientSemaphore); |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 96 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 97 | p->cleanup = (void(*)(DrdClientobj*))semaphore_cleanup; |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 98 | p->value = value; |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 99 | p->waiters = 0; |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 100 | p->last_sem_post_tid = DRD_INVALID_THREADID; |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 101 | p->last_sem_post_seg = VG_(newXA)(VG_(malloc), "drd.sg-stack", |
| 102 | VG_(free), sizeof(Segment*)); |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 103 | } |
| 104 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 105 | /** Free the memory that was allocated by semaphore_initialize(). Called by |
bart | 72b751c | 2008-03-01 13:44:24 +0000 | [diff] [blame] | 106 | * clientobj_remove(). |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 107 | */ |
| 108 | static void semaphore_cleanup(struct semaphore_info* p) |
| 109 | { |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 110 | Segment* sg; |
| 111 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 112 | if (p->waiters > 0) |
| 113 | { |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 114 | SemaphoreErrInfo sei = { p->a1 }; |
| 115 | VG_(maybe_record_error)(VG_(get_running_tid)(), |
| 116 | SemaphoreErr, |
| 117 | VG_(get_IP)(VG_(get_running_tid)()), |
| 118 | "Destruction of semaphore that is being waited" |
| 119 | " upon", |
| 120 | &sei); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 121 | } |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 122 | while ((sg = segment_pop(p))) |
| 123 | sg_put(sg); |
| 124 | VG_(deleteXA)(p->last_sem_post_seg); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 125 | } |
| 126 | |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 127 | static |
| 128 | struct semaphore_info* |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 129 | semaphore_get_or_allocate(const Addr semaphore) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 130 | { |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 131 | struct semaphore_info *p; |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 132 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 133 | tl_assert(offsetof(DrdClientobj, semaphore) == 0); |
bart | 72b751c | 2008-03-01 13:44:24 +0000 | [diff] [blame] | 134 | p = &clientobj_get(semaphore, ClientSemaphore)->semaphore; |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 135 | if (p == 0) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 136 | { |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 137 | tl_assert(offsetof(DrdClientobj, semaphore) == 0); |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 138 | p = &clientobj_add(semaphore, ClientSemaphore)->semaphore; |
| 139 | semaphore_initialize(p, semaphore, 0); |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 140 | } |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 141 | return p; |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 142 | } |
| 143 | |
bart | 72b751c | 2008-03-01 13:44:24 +0000 | [diff] [blame] | 144 | static struct semaphore_info* semaphore_get(const Addr semaphore) |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 145 | { |
| 146 | tl_assert(offsetof(DrdClientobj, semaphore) == 0); |
bart | 72b751c | 2008-03-01 13:44:24 +0000 | [diff] [blame] | 147 | return &clientobj_get(semaphore, ClientSemaphore)->semaphore; |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /** Called before sem_init(). */ |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 151 | struct semaphore_info* semaphore_init(const Addr semaphore, |
bart | afb42b7 | 2008-12-17 07:32:09 +0000 | [diff] [blame] | 152 | const Word pshared, const UInt value) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 153 | { |
| 154 | struct semaphore_info* p; |
| 155 | |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 156 | if (s_trace_semaphore) |
| 157 | { |
| 158 | VG_(message)(Vg_UserMsg, |
bart | afb42b7 | 2008-12-17 07:32:09 +0000 | [diff] [blame] | 159 | "[%d/%d] semaphore_init 0x%lx value %u", |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 160 | VG_(get_running_tid)(), |
| 161 | thread_get_running_tid(), |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 162 | semaphore, |
| 163 | value); |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 164 | } |
bart | d9e39ec | 2008-06-28 15:03:26 +0000 | [diff] [blame] | 165 | p = semaphore_get(semaphore); |
| 166 | if (p) |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 167 | { |
bart | d9e39ec | 2008-06-28 15:03:26 +0000 | [diff] [blame] | 168 | const ThreadId vg_tid = VG_(get_running_tid)(); |
| 169 | SemaphoreErrInfo SEI = { semaphore }; |
| 170 | VG_(maybe_record_error)(vg_tid, |
| 171 | SemaphoreErr, |
| 172 | VG_(get_IP)(vg_tid), |
| 173 | "Semaphore reinitialization", |
| 174 | &SEI); |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 175 | } |
bart | d9e39ec | 2008-06-28 15:03:26 +0000 | [diff] [blame] | 176 | else |
| 177 | { |
| 178 | p = semaphore_get_or_allocate(semaphore); |
| 179 | } |
| 180 | tl_assert(p); |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 181 | p->value = value; |
| 182 | return p; |
| 183 | } |
| 184 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 185 | /** Called after sem_destroy(). */ |
bart | 72b751c | 2008-03-01 13:44:24 +0000 | [diff] [blame] | 186 | void semaphore_destroy(const Addr semaphore) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 187 | { |
bart | 72b751c | 2008-03-01 13:44:24 +0000 | [diff] [blame] | 188 | struct semaphore_info* p; |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 189 | |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 190 | p = semaphore_get(semaphore); |
| 191 | |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 192 | if (s_trace_semaphore) |
| 193 | { |
| 194 | VG_(message)(Vg_UserMsg, |
bart | afb42b7 | 2008-12-17 07:32:09 +0000 | [diff] [blame] | 195 | "[%d/%d] semaphore_destroy 0x%lx value %u", |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 196 | VG_(get_running_tid)(), |
| 197 | thread_get_running_tid(), |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 198 | semaphore, |
| 199 | p ? p->value : 0); |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 200 | } |
| 201 | |
bart | 72b751c | 2008-03-01 13:44:24 +0000 | [diff] [blame] | 202 | if (p == 0) |
| 203 | { |
| 204 | GenericErrInfo GEI; |
| 205 | VG_(maybe_record_error)(VG_(get_running_tid)(), |
| 206 | GenericErr, |
| 207 | VG_(get_IP)(VG_(get_running_tid)()), |
| 208 | "Not a semaphore", |
| 209 | &GEI); |
| 210 | return; |
| 211 | } |
| 212 | |
| 213 | clientobj_remove(semaphore, ClientSemaphore); |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 214 | } |
| 215 | |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 216 | /** Called before sem_wait(). */ |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 217 | void semaphore_pre_wait(const Addr semaphore) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 218 | { |
| 219 | struct semaphore_info* p; |
| 220 | |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 221 | p = semaphore_get_or_allocate(semaphore); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 222 | tl_assert(p); |
bart | 74a5f21 | 2008-05-11 06:43:07 +0000 | [diff] [blame] | 223 | tl_assert((int)p->waiters >= 0); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 224 | p->waiters++; |
| 225 | tl_assert(p->waiters > 0); |
| 226 | } |
| 227 | |
| 228 | /** Called after sem_wait() finished. |
| 229 | * @note Do not rely on the value of 'waited' -- some glibc versions do |
| 230 | * not set it correctly. |
| 231 | */ |
| 232 | void semaphore_post_wait(const DrdThreadId tid, const Addr semaphore, |
| 233 | const Bool waited) |
| 234 | { |
| 235 | struct semaphore_info* p; |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 236 | Segment* sg; |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 237 | |
| 238 | p = semaphore_get(semaphore); |
| 239 | if (s_trace_semaphore) |
| 240 | { |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 241 | VG_(message)(Vg_UserMsg, |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 242 | "[%d/%d] semaphore_wait 0x%lx value %u -> %u", |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 243 | VG_(get_running_tid)(), |
| 244 | thread_get_running_tid(), |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 245 | semaphore, |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 246 | p ? p->value : 0, |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 247 | p ? p->value - 1 : 0); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 248 | } |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 249 | tl_assert(p); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 250 | tl_assert(p->waiters > 0); |
| 251 | p->waiters--; |
bart | 74a5f21 | 2008-05-11 06:43:07 +0000 | [diff] [blame] | 252 | tl_assert((int)p->waiters >= 0); |
| 253 | tl_assert((int)p->value >= 0); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 254 | if (p->value == 0) |
| 255 | { |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 256 | SemaphoreErrInfo sei = { semaphore }; |
| 257 | VG_(maybe_record_error)(VG_(get_running_tid)(), |
| 258 | SemaphoreErr, |
| 259 | VG_(get_IP)(VG_(get_running_tid)()), |
| 260 | "Invalid semaphore", |
| 261 | &sei); |
bart | 28230a3 | 2008-02-29 17:27:03 +0000 | [diff] [blame] | 262 | return; |
| 263 | } |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 264 | p->value--; |
bart | 74a5f21 | 2008-05-11 06:43:07 +0000 | [diff] [blame] | 265 | tl_assert((int)p->value >= 0); |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 266 | sg = segment_pop(p); |
| 267 | if (sg) |
bart | a2b6e1b | 2008-03-17 18:32:39 +0000 | [diff] [blame] | 268 | { |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 269 | if (p->last_sem_post_tid != tid |
| 270 | && p->last_sem_post_tid != DRD_INVALID_THREADID) |
| 271 | { |
| 272 | thread_combine_vc2(tid, &sg->vc); |
| 273 | } |
| 274 | sg_put(sg); |
| 275 | thread_new_segment(tid); |
| 276 | s_semaphore_segment_creation_count++; |
bart | a2b6e1b | 2008-03-17 18:32:39 +0000 | [diff] [blame] | 277 | } |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | /** Called before sem_post(). */ |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 281 | void semaphore_pre_post(const DrdThreadId tid, const Addr semaphore) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 282 | { |
| 283 | struct semaphore_info* p; |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 284 | Segment* sg; |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 285 | |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 286 | p = semaphore_get_or_allocate(semaphore); |
| 287 | p->value++; |
| 288 | |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 289 | if (s_trace_semaphore) |
| 290 | { |
| 291 | VG_(message)(Vg_UserMsg, |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 292 | "[%d/%d] semaphore_post 0x%lx value %u -> %u", |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 293 | VG_(get_running_tid)(), |
| 294 | thread_get_running_tid(), |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 295 | semaphore, |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 296 | p->value - 1, p->value); |
bart | 3b1ee45 | 2008-02-29 19:28:15 +0000 | [diff] [blame] | 297 | } |
bart | da9436b | 2008-12-14 08:56:49 +0000 | [diff] [blame] | 298 | |
bart | 3e017fa | 2008-12-17 19:20:13 +0000 | [diff] [blame^] | 299 | p->last_sem_post_tid = tid; |
| 300 | thread_new_segment(tid); |
| 301 | sg = 0; |
| 302 | thread_get_latest_segment(&sg, tid); |
| 303 | tl_assert(sg); |
| 304 | segment_push(p, sg); |
| 305 | s_semaphore_segment_creation_count++; |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | /** Called after sem_post() finished successfully. */ |
| 309 | void semaphore_post_post(const DrdThreadId tid, const Addr semaphore, |
bart | 0268dfa | 2008-03-11 20:10:21 +0000 | [diff] [blame] | 310 | const Bool waited) |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 311 | { |
bart | 25896d9 | 2008-02-17 09:21:05 +0000 | [diff] [blame] | 312 | /* Note: it is hard to implement the sem_post() wrapper correctly in */ |
| 313 | /* case sem_post() returns an error code. This is because handling this */ |
| 314 | /* case correctly requires restoring the vector clock associated with */ |
| 315 | /* the semaphore to its original value here. In order to do that without */ |
| 316 | /* introducing a race condition, extra locking has to be added around */ |
| 317 | /* each semaphore call. Such extra locking would have to be added in */ |
| 318 | /* drd_intercepts.c. However, it is hard to implement synchronization */ |
| 319 | /* in drd_intercepts.c in a portable way without calling already */ |
| 320 | /* redirected functions. */ |
sewardj | 8564292 | 2008-01-14 11:54:56 +0000 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | void semaphore_thread_delete(const DrdThreadId threadid) |
| 324 | { } |
bart | 6bbefaf | 2008-04-19 15:16:45 +0000 | [diff] [blame] | 325 | |
| 326 | ULong get_semaphore_segment_creation_count(void) |
| 327 | { |
| 328 | return s_semaphore_segment_creation_count; |
| 329 | } |