jkummerow@chromium.org | 05ed9dd | 2012-01-23 14:42:48 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | // Platform specific code for Cygwin goes here. For the POSIX comaptible parts |
| 29 | // the implementation is in platform-posix.cc. |
| 30 | |
| 31 | #include <errno.h> |
| 32 | #include <pthread.h> |
| 33 | #include <semaphore.h> |
| 34 | #include <stdarg.h> |
| 35 | #include <strings.h> // index |
| 36 | #include <sys/time.h> |
| 37 | #include <sys/mman.h> // mmap & munmap |
| 38 | #include <unistd.h> // sysconf |
| 39 | |
| 40 | #undef MAP_TYPE |
| 41 | |
| 42 | #include "v8.h" |
| 43 | |
danno@chromium.org | 8c0a43f | 2012-04-03 08:37:53 +0000 | [diff] [blame] | 44 | #include "platform-posix.h" |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 45 | #include "platform.h" |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 46 | #include "simulator.h" |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 47 | #include "v8threads.h" |
| 48 | #include "vm-state-inl.h" |
| 49 | #include "win32-headers.h" |
| 50 | |
| 51 | namespace v8 { |
| 52 | namespace internal { |
| 53 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 54 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 55 | static Mutex* limit_mutex = NULL; |
| 56 | |
| 57 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 58 | const char* OS::LocalTimezone(double time) { |
ulan@chromium.org | 77ca49a | 2013-04-22 09:43:56 +0000 | [diff] [blame] | 59 | if (std::isnan(time)) return ""; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 60 | time_t tv = static_cast<time_t>(floor(time/msPerSecond)); |
| 61 | struct tm* t = localtime(&tv); |
| 62 | if (NULL == t) return ""; |
| 63 | return tzname[0]; // The location of the timezone string on Cygwin. |
| 64 | } |
| 65 | |
| 66 | |
| 67 | double OS::LocalTimeOffset() { |
| 68 | // On Cygwin, struct tm does not contain a tm_gmtoff field. |
| 69 | time_t utc = time(NULL); |
| 70 | ASSERT(utc != -1); |
| 71 | struct tm* loc = localtime(&utc); |
| 72 | ASSERT(loc != NULL); |
| 73 | // time - localtime includes any daylight savings offset, so subtract it. |
| 74 | return static_cast<double>((mktime(loc) - utc) * msPerSecond - |
| 75 | (loc->tm_isdst > 0 ? 3600 * msPerSecond : 0)); |
| 76 | } |
| 77 | |
| 78 | |
| 79 | // We keep the lowest and highest addresses mapped as a quick way of |
| 80 | // determining that pointers are outside the heap (used mostly in assertions |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 81 | // and verification). The estimate is conservative, i.e., not all addresses in |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 82 | // 'allocated' space are actually allocated to our heap. The range is |
| 83 | // [lowest, highest), inclusive on the low and and exclusive on the high end. |
| 84 | static void* lowest_ever_allocated = reinterpret_cast<void*>(-1); |
| 85 | static void* highest_ever_allocated = reinterpret_cast<void*>(0); |
| 86 | |
| 87 | |
| 88 | static void UpdateAllocatedSpaceLimits(void* address, int size) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 89 | ASSERT(limit_mutex != NULL); |
| 90 | ScopedLock lock(limit_mutex); |
| 91 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 92 | lowest_ever_allocated = Min(lowest_ever_allocated, address); |
| 93 | highest_ever_allocated = |
| 94 | Max(highest_ever_allocated, |
| 95 | reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size)); |
| 96 | } |
| 97 | |
| 98 | |
| 99 | bool OS::IsOutsideAllocatedSpace(void* address) { |
| 100 | return address < lowest_ever_allocated || address >= highest_ever_allocated; |
| 101 | } |
| 102 | |
| 103 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 104 | void* OS::Allocate(const size_t requested, |
| 105 | size_t* allocated, |
| 106 | bool is_executable) { |
| 107 | const size_t msize = RoundUp(requested, sysconf(_SC_PAGESIZE)); |
| 108 | int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| 109 | void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 110 | if (mbase == MAP_FAILED) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 111 | LOG(ISOLATE, StringEvent("OS::Allocate", "mmap failed")); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 112 | return NULL; |
| 113 | } |
| 114 | *allocated = msize; |
| 115 | UpdateAllocatedSpaceLimits(mbase, msize); |
| 116 | return mbase; |
| 117 | } |
| 118 | |
| 119 | |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 120 | void OS::DumpBacktrace() { |
| 121 | // Currently unsupported. |
| 122 | } |
| 123 | |
| 124 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 125 | class PosixMemoryMappedFile : public OS::MemoryMappedFile { |
| 126 | public: |
| 127 | PosixMemoryMappedFile(FILE* file, void* memory, int size) |
| 128 | : file_(file), memory_(memory), size_(size) { } |
| 129 | virtual ~PosixMemoryMappedFile(); |
| 130 | virtual void* memory() { return memory_; } |
| 131 | virtual int size() { return size_; } |
| 132 | private: |
| 133 | FILE* file_; |
| 134 | void* memory_; |
| 135 | int size_; |
| 136 | }; |
| 137 | |
| 138 | |
| 139 | OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { |
| 140 | FILE* file = fopen(name, "r+"); |
| 141 | if (file == NULL) return NULL; |
| 142 | |
| 143 | fseek(file, 0, SEEK_END); |
| 144 | int size = ftell(file); |
| 145 | |
| 146 | void* memory = |
| 147 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 148 | return new PosixMemoryMappedFile(file, memory, size); |
| 149 | } |
| 150 | |
| 151 | |
| 152 | OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, |
| 153 | void* initial) { |
| 154 | FILE* file = fopen(name, "w+"); |
| 155 | if (file == NULL) return NULL; |
| 156 | int result = fwrite(initial, size, 1, file); |
| 157 | if (result < 1) { |
| 158 | fclose(file); |
| 159 | return NULL; |
| 160 | } |
| 161 | void* memory = |
| 162 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 163 | return new PosixMemoryMappedFile(file, memory, size); |
| 164 | } |
| 165 | |
| 166 | |
| 167 | PosixMemoryMappedFile::~PosixMemoryMappedFile() { |
| 168 | if (memory_) munmap(memory_, size_); |
| 169 | fclose(file_); |
| 170 | } |
| 171 | |
| 172 | |
| 173 | void OS::LogSharedLibraryAddresses() { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 174 | // This function assumes that the layout of the file is as follows: |
| 175 | // hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name] |
| 176 | // If we encounter an unexpected situation we abort scanning further entries. |
| 177 | FILE* fp = fopen("/proc/self/maps", "r"); |
| 178 | if (fp == NULL) return; |
| 179 | |
| 180 | // Allocate enough room to be able to store a full file name. |
| 181 | const int kLibNameLen = FILENAME_MAX + 1; |
| 182 | char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen)); |
| 183 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 184 | i::Isolate* isolate = ISOLATE; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 185 | // This loop will terminate once the scanning hits an EOF. |
| 186 | while (true) { |
| 187 | uintptr_t start, end; |
| 188 | char attr_r, attr_w, attr_x, attr_p; |
| 189 | // Parse the addresses and permission bits at the beginning of the line. |
| 190 | if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break; |
| 191 | if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break; |
| 192 | |
| 193 | int c; |
| 194 | if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') { |
| 195 | // Found a read-only executable entry. Skip characters until we reach |
| 196 | // the beginning of the filename or the end of the line. |
| 197 | do { |
| 198 | c = getc(fp); |
| 199 | } while ((c != EOF) && (c != '\n') && (c != '/')); |
| 200 | if (c == EOF) break; // EOF: Was unexpected, just exit. |
| 201 | |
| 202 | // Process the filename if found. |
| 203 | if (c == '/') { |
| 204 | ungetc(c, fp); // Push the '/' back into the stream to be read below. |
| 205 | |
| 206 | // Read to the end of the line. Exit if the read fails. |
| 207 | if (fgets(lib_name, kLibNameLen, fp) == NULL) break; |
| 208 | |
| 209 | // Drop the newline character read by fgets. We do not need to check |
| 210 | // for a zero-length string because we know that we at least read the |
| 211 | // '/' character. |
| 212 | lib_name[strlen(lib_name) - 1] = '\0'; |
| 213 | } else { |
| 214 | // No library name found, just record the raw address range. |
| 215 | snprintf(lib_name, kLibNameLen, |
| 216 | "%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end); |
| 217 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 218 | LOG(isolate, SharedLibraryEvent(lib_name, start, end)); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 219 | } else { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 220 | // Entry not describing executable data. Skip to end of line to set up |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 221 | // reading the next entry. |
| 222 | do { |
| 223 | c = getc(fp); |
| 224 | } while ((c != EOF) && (c != '\n')); |
| 225 | if (c == EOF) break; |
| 226 | } |
| 227 | } |
| 228 | free(lib_name); |
| 229 | fclose(fp); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | |
| 233 | void OS::SignalCodeMovingGC() { |
| 234 | // Nothing to do on Cygwin. |
| 235 | } |
| 236 | |
| 237 | |
| 238 | int OS::StackWalk(Vector<OS::StackFrame> frames) { |
| 239 | // Not supported on Cygwin. |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 244 | // The VirtualMemory implementation is taken from platform-win32.cc. |
| 245 | // The mmap-based virtual memory implementation as it is used on most posix |
| 246 | // platforms does not work well because Cygwin does not support MAP_FIXED. |
| 247 | // This causes VirtualMemory::Commit to not always commit the memory region |
| 248 | // specified. |
| 249 | |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 250 | static void* GetRandomAddr() { |
| 251 | Isolate* isolate = Isolate::UncheckedCurrent(); |
| 252 | // Note that the current isolate isn't set up in a call path via |
| 253 | // CpuFeatures::Probe. We don't care about randomization in this case because |
| 254 | // the code page is immediately freed. |
| 255 | if (isolate != NULL) { |
| 256 | // The address range used to randomize RWX allocations in OS::Allocate |
| 257 | // Try not to map pages into the default range that windows loads DLLs |
| 258 | // Use a multiple of 64k to prevent committing unused memory. |
| 259 | // Note: This does not guarantee RWX regions will be within the |
| 260 | // range kAllocationRandomAddressMin to kAllocationRandomAddressMax |
| 261 | #ifdef V8_HOST_ARCH_64_BIT |
| 262 | static const intptr_t kAllocationRandomAddressMin = 0x0000000080000000; |
| 263 | static const intptr_t kAllocationRandomAddressMax = 0x000003FFFFFF0000; |
| 264 | #else |
| 265 | static const intptr_t kAllocationRandomAddressMin = 0x04000000; |
| 266 | static const intptr_t kAllocationRandomAddressMax = 0x3FFF0000; |
| 267 | #endif |
| 268 | uintptr_t address = (V8::RandomPrivate(isolate) << kPageSizeBits) |
| 269 | | kAllocationRandomAddressMin; |
| 270 | address &= kAllocationRandomAddressMax; |
| 271 | return reinterpret_cast<void *>(address); |
| 272 | } |
| 273 | return NULL; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 274 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 275 | |
| 276 | |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 277 | static void* RandomizedVirtualAlloc(size_t size, int action, int protection) { |
| 278 | LPVOID base = NULL; |
| 279 | |
| 280 | if (protection == PAGE_EXECUTE_READWRITE || protection == PAGE_NOACCESS) { |
| 281 | // For exectutable pages try and randomize the allocation address |
| 282 | for (size_t attempts = 0; base == NULL && attempts < 3; ++attempts) { |
| 283 | base = VirtualAlloc(GetRandomAddr(), size, action, protection); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | // After three attempts give up and let the OS find an address to use. |
| 288 | if (base == NULL) base = VirtualAlloc(NULL, size, action, protection); |
| 289 | |
| 290 | return base; |
| 291 | } |
| 292 | |
| 293 | |
| 294 | VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } |
| 295 | |
| 296 | |
| 297 | VirtualMemory::VirtualMemory(size_t size) |
| 298 | : address_(ReserveRegion(size)), size_(size) { } |
| 299 | |
| 300 | |
| 301 | VirtualMemory::VirtualMemory(size_t size, size_t alignment) |
| 302 | : address_(NULL), size_(0) { |
| 303 | ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment()))); |
| 304 | size_t request_size = RoundUp(size + alignment, |
| 305 | static_cast<intptr_t>(OS::AllocateAlignment())); |
| 306 | void* address = ReserveRegion(request_size); |
| 307 | if (address == NULL) return; |
| 308 | Address base = RoundUp(static_cast<Address>(address), alignment); |
| 309 | // Try reducing the size by freeing and then reallocating a specific area. |
| 310 | bool result = ReleaseRegion(address, request_size); |
| 311 | USE(result); |
| 312 | ASSERT(result); |
| 313 | address = VirtualAlloc(base, size, MEM_RESERVE, PAGE_NOACCESS); |
| 314 | if (address != NULL) { |
| 315 | request_size = size; |
| 316 | ASSERT(base == static_cast<Address>(address)); |
| 317 | } else { |
| 318 | // Resizing failed, just go with a bigger area. |
| 319 | address = ReserveRegion(request_size); |
| 320 | if (address == NULL) return; |
| 321 | } |
| 322 | address_ = address; |
| 323 | size_ = request_size; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | |
| 327 | VirtualMemory::~VirtualMemory() { |
| 328 | if (IsReserved()) { |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 329 | bool result = ReleaseRegion(address_, size_); |
| 330 | ASSERT(result); |
| 331 | USE(result); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 332 | } |
| 333 | } |
| 334 | |
| 335 | |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 336 | bool VirtualMemory::IsReserved() { |
| 337 | return address_ != NULL; |
| 338 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 339 | |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 340 | |
| 341 | void VirtualMemory::Reset() { |
| 342 | address_ = NULL; |
| 343 | size_ = 0; |
| 344 | } |
| 345 | |
| 346 | |
| 347 | bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { |
| 348 | return CommitRegion(address, size, is_executable); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | |
| 352 | bool VirtualMemory::Uncommit(void* address, size_t size) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 353 | ASSERT(IsReserved()); |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 354 | return UncommitRegion(address, size); |
| 355 | } |
| 356 | |
| 357 | |
| 358 | void* VirtualMemory::ReserveRegion(size_t size) { |
| 359 | return RandomizedVirtualAlloc(size, MEM_RESERVE, PAGE_NOACCESS); |
| 360 | } |
| 361 | |
| 362 | |
| 363 | bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { |
| 364 | int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; |
| 365 | if (NULL == VirtualAlloc(base, size, MEM_COMMIT, prot)) { |
| 366 | return false; |
| 367 | } |
| 368 | |
| 369 | UpdateAllocatedSpaceLimits(base, static_cast<int>(size)); |
| 370 | return true; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | |
yangguo@chromium.org | ab30bb8 | 2012-02-24 14:41:46 +0000 | [diff] [blame] | 374 | bool VirtualMemory::Guard(void* address) { |
| 375 | if (NULL == VirtualAlloc(address, |
| 376 | OS::CommitPageSize(), |
| 377 | MEM_COMMIT, |
| 378 | PAGE_READONLY | PAGE_GUARD)) { |
| 379 | return false; |
| 380 | } |
| 381 | return true; |
| 382 | } |
| 383 | |
| 384 | |
mstarzinger@chromium.org | e27d617 | 2013-04-17 11:51:44 +0000 | [diff] [blame] | 385 | bool VirtualMemory::UncommitRegion(void* base, size_t size) { |
| 386 | return VirtualFree(base, size, MEM_DECOMMIT) != 0; |
| 387 | } |
| 388 | |
| 389 | |
| 390 | bool VirtualMemory::ReleaseRegion(void* base, size_t size) { |
| 391 | return VirtualFree(base, 0, MEM_RELEASE) != 0; |
| 392 | } |
| 393 | |
| 394 | |
danno@chromium.org | 72204d5 | 2012-10-31 10:02:10 +0000 | [diff] [blame] | 395 | bool VirtualMemory::HasLazyCommits() { |
| 396 | // TODO(alph): implement for the platform. |
| 397 | return false; |
| 398 | } |
| 399 | |
| 400 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 401 | class CygwinSemaphore : public Semaphore { |
| 402 | public: |
| 403 | explicit CygwinSemaphore(int count) { sem_init(&sem_, 0, count); } |
| 404 | virtual ~CygwinSemaphore() { sem_destroy(&sem_); } |
| 405 | |
| 406 | virtual void Wait(); |
| 407 | virtual bool Wait(int timeout); |
| 408 | virtual void Signal() { sem_post(&sem_); } |
| 409 | private: |
| 410 | sem_t sem_; |
| 411 | }; |
| 412 | |
| 413 | |
| 414 | void CygwinSemaphore::Wait() { |
| 415 | while (true) { |
| 416 | int result = sem_wait(&sem_); |
| 417 | if (result == 0) return; // Successfully got semaphore. |
| 418 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | |
| 423 | #ifndef TIMEVAL_TO_TIMESPEC |
| 424 | #define TIMEVAL_TO_TIMESPEC(tv, ts) do { \ |
| 425 | (ts)->tv_sec = (tv)->tv_sec; \ |
| 426 | (ts)->tv_nsec = (tv)->tv_usec * 1000; \ |
| 427 | } while (false) |
| 428 | #endif |
| 429 | |
| 430 | |
| 431 | bool CygwinSemaphore::Wait(int timeout) { |
| 432 | const long kOneSecondMicros = 1000000; // NOLINT |
| 433 | |
| 434 | // Split timeout into second and nanosecond parts. |
| 435 | struct timeval delta; |
| 436 | delta.tv_usec = timeout % kOneSecondMicros; |
| 437 | delta.tv_sec = timeout / kOneSecondMicros; |
| 438 | |
| 439 | struct timeval current_time; |
| 440 | // Get the current time. |
| 441 | if (gettimeofday(¤t_time, NULL) == -1) { |
| 442 | return false; |
| 443 | } |
| 444 | |
| 445 | // Calculate time for end of timeout. |
| 446 | struct timeval end_time; |
| 447 | timeradd(¤t_time, &delta, &end_time); |
| 448 | |
| 449 | struct timespec ts; |
| 450 | TIMEVAL_TO_TIMESPEC(&end_time, &ts); |
| 451 | // Wait for semaphore signalled or timeout. |
| 452 | while (true) { |
| 453 | int result = sem_timedwait(&sem_, &ts); |
| 454 | if (result == 0) return true; // Successfully got semaphore. |
| 455 | if (result == -1 && errno == ETIMEDOUT) return false; // Timeout. |
| 456 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | |
| 461 | Semaphore* OS::CreateSemaphore(int count) { |
| 462 | return new CygwinSemaphore(count); |
| 463 | } |
| 464 | |
| 465 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 466 | void OS::SetUp() { |
| 467 | // Seed the random number generator. |
| 468 | // Convert the current time to a 64-bit integer first, before converting it |
| 469 | // to an unsigned. Going directly can cause an overflow and the seed to be |
| 470 | // set to all ones. The seed will be identical for different instances that |
| 471 | // call this setup code within the same millisecond. |
| 472 | uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); |
| 473 | srandom(static_cast<unsigned int>(seed)); |
| 474 | limit_mutex = CreateMutex(); |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | |
erik.corry@gmail.com | ed49e96 | 2012-04-17 11:57:53 +0000 | [diff] [blame] | 478 | void OS::TearDown() { |
erik.corry@gmail.com | ed49e96 | 2012-04-17 11:57:53 +0000 | [diff] [blame] | 479 | delete limit_mutex; |
| 480 | } |
| 481 | |
| 482 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 483 | } } // namespace v8::internal |