| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "platform/semaphore.h" |
| |
| #if V8_OS_MACOSX |
| #include <mach/mach_init.h> |
| #include <mach/task.h> |
| #endif |
| |
| #include <cerrno> |
| |
| #include "checks.h" |
| #include "platform/time.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #if V8_OS_MACOSX |
| |
| Semaphore::Semaphore(int count) { |
| kern_return_t result = semaphore_create( |
| mach_task_self(), &native_handle_, SYNC_POLICY_FIFO, count); |
| ASSERT_EQ(KERN_SUCCESS, result); |
| USE(result); |
| } |
| |
| |
| Semaphore::~Semaphore() { |
| kern_return_t result = semaphore_destroy(mach_task_self(), native_handle_); |
| ASSERT_EQ(KERN_SUCCESS, result); |
| USE(result); |
| } |
| |
| |
| void Semaphore::Signal() { |
| kern_return_t result = semaphore_signal(native_handle_); |
| ASSERT_EQ(KERN_SUCCESS, result); |
| USE(result); |
| } |
| |
| |
| void Semaphore::Wait() { |
| while (true) { |
| kern_return_t result = semaphore_wait(native_handle_); |
| if (result == KERN_SUCCESS) return; // Semaphore was signalled. |
| ASSERT_EQ(KERN_ABORTED, result); |
| } |
| } |
| |
| |
| bool Semaphore::WaitFor(const TimeDelta& rel_time) { |
| TimeTicks now = TimeTicks::Now(); |
| TimeTicks end = now + rel_time; |
| while (true) { |
| mach_timespec_t ts; |
| if (now >= end) { |
| // Return immediately if semaphore was not signalled. |
| ts.tv_sec = 0; |
| ts.tv_nsec = 0; |
| } else { |
| ts = (end - now).ToMachTimespec(); |
| } |
| kern_return_t result = semaphore_timedwait(native_handle_, ts); |
| if (result == KERN_SUCCESS) return true; // Semaphore was signalled. |
| if (result == KERN_OPERATION_TIMED_OUT) return false; // Timeout. |
| ASSERT_EQ(KERN_ABORTED, result); |
| now = TimeTicks::Now(); |
| } |
| } |
| |
| #elif V8_OS_POSIX |
| |
| Semaphore::Semaphore(int count) { |
| ASSERT(count >= 0); |
| int result = sem_init(&native_handle_, 0, count); |
| ASSERT_EQ(0, result); |
| USE(result); |
| } |
| |
| |
| Semaphore::~Semaphore() { |
| int result = sem_destroy(&native_handle_); |
| ASSERT_EQ(0, result); |
| USE(result); |
| } |
| |
| |
| void Semaphore::Signal() { |
| int result = sem_post(&native_handle_); |
| ASSERT_EQ(0, result); |
| USE(result); |
| } |
| |
| |
| void Semaphore::Wait() { |
| while (true) { |
| int result = sem_wait(&native_handle_); |
| if (result == 0) return; // Semaphore was signalled. |
| // Signal caused spurious wakeup. |
| ASSERT_EQ(-1, result); |
| ASSERT_EQ(EINTR, errno); |
| } |
| } |
| |
| |
| bool Semaphore::WaitFor(const TimeDelta& rel_time) { |
| // Compute the time for end of timeout. |
| const Time time = Time::NowFromSystemTime() + rel_time; |
| const struct timespec ts = time.ToTimespec(); |
| |
| // Wait for semaphore signalled or timeout. |
| while (true) { |
| int result = sem_timedwait(&native_handle_, &ts); |
| if (result == 0) return true; // Semaphore was signalled. |
| #if V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) |
| if (result > 0) { |
| // sem_timedwait in glibc prior to 2.3.4 returns the errno instead of -1. |
| errno = result; |
| result = -1; |
| } |
| #endif |
| if (result == -1 && errno == ETIMEDOUT) { |
| // Timed out while waiting for semaphore. |
| return false; |
| } |
| // Signal caused spurious wakeup. |
| ASSERT_EQ(-1, result); |
| ASSERT_EQ(EINTR, errno); |
| } |
| } |
| |
| #elif V8_OS_WIN |
| |
| Semaphore::Semaphore(int count) { |
| ASSERT(count >= 0); |
| native_handle_ = ::CreateSemaphoreA(NULL, count, 0x7fffffff, NULL); |
| ASSERT(native_handle_ != NULL); |
| } |
| |
| |
| Semaphore::~Semaphore() { |
| BOOL result = CloseHandle(native_handle_); |
| ASSERT(result); |
| USE(result); |
| } |
| |
| |
| void Semaphore::Signal() { |
| LONG dummy; |
| BOOL result = ReleaseSemaphore(native_handle_, 1, &dummy); |
| ASSERT(result); |
| USE(result); |
| } |
| |
| |
| void Semaphore::Wait() { |
| DWORD result = WaitForSingleObject(native_handle_, INFINITE); |
| ASSERT(result == WAIT_OBJECT_0); |
| USE(result); |
| } |
| |
| |
| bool Semaphore::WaitFor(const TimeDelta& rel_time) { |
| TimeTicks now = TimeTicks::Now(); |
| TimeTicks end = now + rel_time; |
| while (true) { |
| int64_t msec = (end - now).InMilliseconds(); |
| if (msec >= static_cast<int64_t>(INFINITE)) { |
| DWORD result = WaitForSingleObject(native_handle_, INFINITE - 1); |
| if (result == WAIT_OBJECT_0) { |
| return true; |
| } |
| ASSERT(result == WAIT_TIMEOUT); |
| now = TimeTicks::Now(); |
| } else { |
| DWORD result = WaitForSingleObject( |
| native_handle_, (msec < 0) ? 0 : static_cast<DWORD>(msec)); |
| if (result == WAIT_TIMEOUT) { |
| return false; |
| } |
| ASSERT(result == WAIT_OBJECT_0); |
| return true; |
| } |
| } |
| } |
| |
| #endif // V8_OS_MACOSX |
| |
| } } // namespace v8::internal |