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| 1 // Copyright 2013 the V8 project authors. All rights reserved. |
| 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 #include "platform/semaphore.h" |
| 29 |
| 30 #if V8_OS_MACOSX |
| 31 #include <mach/mach_init.h> |
| 32 #include <mach/task.h> |
| 33 #endif |
| 34 |
| 35 #include <cerrno> |
| 36 |
| 37 #include "checks.h" |
| 38 #include "platform/time.h" |
| 39 |
| 40 namespace v8 { |
| 41 namespace internal { |
| 42 |
| 43 #if V8_OS_MACOSX |
| 44 |
| 45 Semaphore::Semaphore(int count) { |
| 46 kern_return_t result = semaphore_create( |
| 47 mach_task_self(), &native_handle_, SYNC_POLICY_FIFO, count); |
| 48 ASSERT_EQ(KERN_SUCCESS, result); |
| 49 USE(result); |
| 50 } |
| 51 |
| 52 |
| 53 Semaphore::~Semaphore() { |
| 54 kern_return_t result = semaphore_destroy(mach_task_self(), native_handle_); |
| 55 ASSERT_EQ(KERN_SUCCESS, result); |
| 56 USE(result); |
| 57 } |
| 58 |
| 59 |
| 60 void Semaphore::Signal() { |
| 61 kern_return_t result = semaphore_signal(native_handle_); |
| 62 ASSERT_EQ(KERN_SUCCESS, result); |
| 63 USE(result); |
| 64 } |
| 65 |
| 66 |
| 67 void Semaphore::Wait() { |
| 68 while (true) { |
| 69 kern_return_t result = semaphore_wait(native_handle_); |
| 70 if (result == KERN_SUCCESS) return; // Semaphore was signalled. |
| 71 ASSERT_EQ(KERN_ABORTED, result); |
| 72 } |
| 73 } |
| 74 |
| 75 |
| 76 bool Semaphore::WaitFor(const TimeDelta& rel_time) { |
| 77 TimeTicks now = TimeTicks::Now(); |
| 78 TimeTicks end = now + rel_time; |
| 79 while (true) { |
| 80 mach_timespec_t ts; |
| 81 if (now >= end) { |
| 82 // Return immediately if semaphore was not signalled. |
| 83 ts.tv_sec = 0; |
| 84 ts.tv_nsec = 0; |
| 85 } else { |
| 86 ts = (end - now).ToMachTimespec(); |
| 87 } |
| 88 kern_return_t result = semaphore_timedwait(native_handle_, ts); |
| 89 if (result == KERN_SUCCESS) return true; // Semaphore was signalled. |
| 90 if (result == KERN_OPERATION_TIMED_OUT) return false; // Timeout. |
| 91 ASSERT_EQ(KERN_ABORTED, result); |
| 92 now = TimeTicks::Now(); |
| 93 } |
| 94 } |
| 95 |
| 96 #elif V8_OS_POSIX |
| 97 |
| 98 Semaphore::Semaphore(int count) { |
| 99 ASSERT(count >= 0); |
| 100 int result = sem_init(&native_handle_, 0, count); |
| 101 ASSERT_EQ(0, result); |
| 102 USE(result); |
| 103 } |
| 104 |
| 105 |
| 106 Semaphore::~Semaphore() { |
| 107 int result = sem_destroy(&native_handle_); |
| 108 ASSERT_EQ(0, result); |
| 109 USE(result); |
| 110 } |
| 111 |
| 112 |
| 113 void Semaphore::Signal() { |
| 114 int result = sem_post(&native_handle_); |
| 115 ASSERT_EQ(0, result); |
| 116 USE(result); |
| 117 } |
| 118 |
| 119 |
| 120 void Semaphore::Wait() { |
| 121 while (true) { |
| 122 int result = sem_wait(&native_handle_); |
| 123 if (result == 0) return; // Semaphore was signalled. |
| 124 // Signal caused spurious wakeup. |
| 125 ASSERT_EQ(-1, result); |
| 126 ASSERT_EQ(EINTR, errno); |
| 127 } |
| 128 } |
| 129 |
| 130 |
| 131 bool Semaphore::WaitFor(const TimeDelta& rel_time) { |
| 132 // Compute the time for end of timeout. |
| 133 const Time time = Time::NowFromSystemTime() + rel_time; |
| 134 const struct timespec ts = time.ToTimespec(); |
| 135 |
| 136 // Wait for semaphore signalled or timeout. |
| 137 while (true) { |
| 138 int result = sem_timedwait(&native_handle_, &ts); |
| 139 if (result == 0) return true; // Semaphore was signalled. |
| 140 #if V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) |
| 141 if (result > 0) { |
| 142 // sem_timedwait in glibc prior to 2.3.4 returns the errno instead of -1. |
| 143 errno = result; |
| 144 result = -1; |
| 145 } |
| 146 #endif |
| 147 if (result == -1 && errno == ETIMEDOUT) { |
| 148 // Timed out while waiting for semaphore. |
| 149 return false; |
| 150 } |
| 151 // Signal caused spurious wakeup. |
| 152 ASSERT_EQ(-1, result); |
| 153 ASSERT_EQ(EINTR, errno); |
| 154 } |
| 155 } |
| 156 |
| 157 #elif V8_OS_WIN |
| 158 |
| 159 Semaphore::Semaphore(int count) { |
| 160 ASSERT(count >= 0); |
| 161 native_handle_ = ::CreateSemaphoreA(NULL, count, 0x7fffffff, NULL); |
| 162 ASSERT(native_handle_ != NULL); |
| 163 } |
| 164 |
| 165 |
| 166 Semaphore::~Semaphore() { |
| 167 BOOL result = CloseHandle(native_handle_); |
| 168 ASSERT(result); |
| 169 USE(result); |
| 170 } |
| 171 |
| 172 |
| 173 void Semaphore::Signal() { |
| 174 LONG dummy; |
| 175 BOOL result = ReleaseSemaphore(native_handle_, 1, &dummy); |
| 176 ASSERT(result); |
| 177 USE(result); |
| 178 } |
| 179 |
| 180 |
| 181 void Semaphore::Wait() { |
| 182 DWORD result = WaitForSingleObject(native_handle_, INFINITE); |
| 183 ASSERT(result == WAIT_OBJECT_0); |
| 184 USE(result); |
| 185 } |
| 186 |
| 187 |
| 188 bool Semaphore::WaitFor(const TimeDelta& rel_time) { |
| 189 TimeTicks now = TimeTicks::Now(); |
| 190 TimeTicks end = now + rel_time; |
| 191 while (true) { |
| 192 int64_t msec = (end - now).InMilliseconds(); |
| 193 if (msec >= static_cast<int64_t>(INFINITE)) { |
| 194 DWORD result = WaitForSingleObject(native_handle_, INFINITE - 1); |
| 195 if (result == WAIT_OBJECT_0) { |
| 196 return true; |
| 197 } |
| 198 ASSERT(result == WAIT_TIMEOUT); |
| 199 now = TimeTicks::Now(); |
| 200 } else { |
| 201 DWORD result = WaitForSingleObject( |
| 202 native_handle_, (msec < 0) ? 0 : static_cast<DWORD>(msec)); |
| 203 if (result == WAIT_TIMEOUT) { |
| 204 return false; |
| 205 } |
| 206 ASSERT(result == WAIT_OBJECT_0); |
| 207 return true; |
| 208 } |
| 209 } |
| 210 } |
| 211 |
| 212 #endif // V8_OS_MACOSX |
| 213 |
| 214 } } // namespace v8::internal |
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