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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/globals.h" // NOLINT
#if defined(TARGET_OS_ANDROID)
#include "vm/os_thread.h"
#include <errno.h> // NOLINT
#include <sys/time.h> // NOLINT
#include "platform/assert.h"
namespace dart {
#define VALIDATE_PTHREAD_RESULT(result) \
if (result != 0) { \
const int kBufferSize = 1024; \
char error_message[kBufferSize]; \
strerror_r(result, error_message, kBufferSize); \
FATAL2("pthread error: %d (%s)", result, error_message); \
}
#if defined(DEBUG)
#define ASSERT_PTHREAD_SUCCESS(result) VALIDATE_PTHREAD_RESULT(result)
#else
// NOTE: This (currently) expands to a no-op.
#define ASSERT_PTHREAD_SUCCESS(result) ASSERT(result == 0)
#endif
#ifdef DEBUG
#define RETURN_ON_PTHREAD_FAILURE(result) \
if (result != 0) { \
const int kBufferSize = 1024; \
char error_message[kBufferSize]; \
strerror_r(result, error_message, kBufferSize); \
fprintf(stderr, "%s:%d: pthread error: %d (%s)\n", \
__FILE__, __LINE__, result, error_message); \
return result; \
}
#else
#define RETURN_ON_PTHREAD_FAILURE(result) \
if (result != 0) return result;
#endif
static void ComputeTimeSpecMicros(struct timespec* ts, int64_t micros) {
struct timeval tv;
int64_t secs = micros / kMicrosecondsPerSecond;
int64_t remaining_micros = (micros - (secs * kMicrosecondsPerSecond));
int result = gettimeofday(&tv, NULL);
ASSERT(result == 0);
ts->tv_sec = tv.tv_sec + secs;
ts->tv_nsec = (tv.tv_usec + remaining_micros) * kNanosecondsPerMicrosecond;
if (ts->tv_nsec >= kNanosecondsPerSecond) {
ts->tv_sec += 1;
ts->tv_nsec -= kNanosecondsPerSecond;
}
}
class ThreadStartData {
public:
ThreadStartData(OSThread::ThreadStartFunction function,
uword parameter)
: function_(function), parameter_(parameter) {}
OSThread::ThreadStartFunction function() const { return function_; }
uword parameter() const { return parameter_; }
private:
OSThread::ThreadStartFunction function_;
uword parameter_;
DISALLOW_COPY_AND_ASSIGN(ThreadStartData);
};
// Dispatch to the thread start function provided by the caller. This trampoline
// is used to ensure that the thread is properly destroyed if the thread just
// exits.
static void* ThreadStart(void* data_ptr) {
ThreadStartData* data = reinterpret_cast<ThreadStartData*>(data_ptr);
OSThread::ThreadStartFunction function = data->function();
uword parameter = data->parameter();
delete data;
// Call the supplied thread start function handing it its parameters.
function(parameter);
return NULL;
}
int OSThread::Start(ThreadStartFunction function, uword parameter) {
pthread_attr_t attr;
int result = pthread_attr_init(&attr);
RETURN_ON_PTHREAD_FAILURE(result);
result = pthread_attr_setstacksize(&attr, OSThread::GetMaxStackSize());
RETURN_ON_PTHREAD_FAILURE(result);
ThreadStartData* data = new ThreadStartData(function, parameter);
pthread_t tid;
result = pthread_create(&tid, &attr, ThreadStart, data);
RETURN_ON_PTHREAD_FAILURE(result);
result = pthread_attr_destroy(&attr);
RETURN_ON_PTHREAD_FAILURE(result);
return 0;
}
ThreadLocalKey OSThread::kUnsetThreadLocalKey =
static_cast<pthread_key_t>(-1);
ThreadId OSThread::kInvalidThreadId = static_cast<ThreadId>(0);
ThreadJoinId OSThread::kInvalidThreadJoinId = static_cast<ThreadJoinId>(0);
ThreadLocalKey OSThread::CreateThreadLocal(ThreadDestructor destructor) {
pthread_key_t key = kUnsetThreadLocalKey;
int result = pthread_key_create(&key, destructor);
VALIDATE_PTHREAD_RESULT(result);
ASSERT(key != kUnsetThreadLocalKey);
return key;
}
void OSThread::DeleteThreadLocal(ThreadLocalKey key) {
ASSERT(key != kUnsetThreadLocalKey);
int result = pthread_key_delete(key);
VALIDATE_PTHREAD_RESULT(result);
}
void OSThread::SetThreadLocal(ThreadLocalKey key, uword value) {
ASSERT(key != kUnsetThreadLocalKey);
int result = pthread_setspecific(key, reinterpret_cast<void*>(value));
VALIDATE_PTHREAD_RESULT(result);
}
intptr_t OSThread::GetMaxStackSize() {
const int kStackSize = (128 * kWordSize * KB);
return kStackSize;
}
ThreadId OSThread::GetCurrentThreadId() {
return gettid();
}
ThreadId OSThread::GetCurrentThreadTraceId() {
return GetCurrentThreadId();
}
ThreadJoinId OSThread::GetCurrentThreadJoinId() {
return pthread_self();
}
void OSThread::Join(ThreadJoinId id) {
int result = pthread_join(id, NULL);
ASSERT(result == 0);
}
intptr_t OSThread::ThreadIdToIntPtr(ThreadId id) {
ASSERT(sizeof(id) == sizeof(intptr_t));
return static_cast<intptr_t>(id);
}
ThreadId OSThread::ThreadIdFromIntPtr(intptr_t id) {
return static_cast<ThreadId>(id);
}
bool OSThread::Compare(ThreadId a, ThreadId b) {
return a == b;
}
void OSThread::GetThreadCpuUsage(ThreadId thread_id, int64_t* cpu_usage) {
ASSERT(thread_id == GetCurrentThreadId());
ASSERT(cpu_usage != NULL);
struct timespec ts;
int r = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
ASSERT(r == 0);
*cpu_usage = (ts.tv_sec * kNanosecondsPerSecond + ts.tv_nsec) /
kNanosecondsPerMicrosecond;
}
Mutex::Mutex() {
pthread_mutexattr_t attr;
int result = pthread_mutexattr_init(&attr);
VALIDATE_PTHREAD_RESULT(result);
#if defined(DEBUG)
result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
VALIDATE_PTHREAD_RESULT(result);
#endif // defined(DEBUG)
result = pthread_mutex_init(data_.mutex(), &attr);
// Verify that creating a pthread_mutex succeeded.
VALIDATE_PTHREAD_RESULT(result);
result = pthread_mutexattr_destroy(&attr);
VALIDATE_PTHREAD_RESULT(result);
// When running with assertions enabled we do track the owner.
#if defined(DEBUG)
owner_ = OSThread::kInvalidThreadId;
#endif // defined(DEBUG)
}
Mutex::~Mutex() {
int result = pthread_mutex_destroy(data_.mutex());
// Verify that the pthread_mutex was destroyed.
VALIDATE_PTHREAD_RESULT(result);
// When running with assertions enabled we do track the owner.
#if defined(DEBUG)
ASSERT(owner_ == OSThread::kInvalidThreadId);
#endif // defined(DEBUG)
}
void Mutex::Lock() {
int result = pthread_mutex_lock(data_.mutex());
// Specifically check for dead lock to help debugging.
ASSERT(result != EDEADLK);
ASSERT_PTHREAD_SUCCESS(result); // Verify no other errors.
// When running with assertions enabled we do track the owner.
#if defined(DEBUG)
owner_ = OSThread::GetCurrentThreadId();
#endif // defined(DEBUG)
}
bool Mutex::TryLock() {
int result = pthread_mutex_trylock(data_.mutex());
// Return false if the lock is busy and locking failed.
if (result == EBUSY) {
return false;
}
ASSERT_PTHREAD_SUCCESS(result); // Verify no other errors.
// When running with assertions enabled we do track the owner.
#if defined(DEBUG)
owner_ = OSThread::GetCurrentThreadId();
#endif // defined(DEBUG)
return true;
}
void Mutex::Unlock() {
// When running with assertions enabled we do track the owner.
#if defined(DEBUG)
ASSERT(IsOwnedByCurrentThread());
owner_ = OSThread::kInvalidThreadId;
#endif // defined(DEBUG)
int result = pthread_mutex_unlock(data_.mutex());
// Specifically check for wrong thread unlocking to aid debugging.
ASSERT(result != EPERM);
ASSERT_PTHREAD_SUCCESS(result); // Verify no other errors.
}
Monitor::Monitor() {
pthread_mutexattr_t mutex_attr;
int result = pthread_mutexattr_init(&mutex_attr);
VALIDATE_PTHREAD_RESULT(result);
#if defined(DEBUG)
result = pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_ERRORCHECK);
VALIDATE_PTHREAD_RESULT(result);
#endif // defined(DEBUG)
result = pthread_mutex_init(data_.mutex(), &mutex_attr);
VALIDATE_PTHREAD_RESULT(result);
result = pthread_mutexattr_destroy(&mutex_attr);
VALIDATE_PTHREAD_RESULT(result);
pthread_condattr_t cond_attr;
result = pthread_condattr_init(&cond_attr);
VALIDATE_PTHREAD_RESULT(result);
result = pthread_cond_init(data_.cond(), &cond_attr);
VALIDATE_PTHREAD_RESULT(result);
result = pthread_condattr_destroy(&cond_attr);
VALIDATE_PTHREAD_RESULT(result);
}
Monitor::~Monitor() {
int result = pthread_mutex_destroy(data_.mutex());
VALIDATE_PTHREAD_RESULT(result);
result = pthread_cond_destroy(data_.cond());
VALIDATE_PTHREAD_RESULT(result);
}
void Monitor::Enter() {
int result = pthread_mutex_lock(data_.mutex());
VALIDATE_PTHREAD_RESULT(result);
// TODO(iposva): Do we need to track lock owners?
}
void Monitor::Exit() {
// TODO(iposva): Do we need to track lock owners?
int result = pthread_mutex_unlock(data_.mutex());
VALIDATE_PTHREAD_RESULT(result);
}
Monitor::WaitResult Monitor::Wait(int64_t millis) {
return WaitMicros(millis * kMicrosecondsPerMillisecond);
}
Monitor::WaitResult Monitor::WaitMicros(int64_t micros) {
// TODO(iposva): Do we need to track lock owners?
Monitor::WaitResult retval = kNotified;
if (micros == kNoTimeout) {
// Wait forever.
int result = pthread_cond_wait(data_.cond(), data_.mutex());
VALIDATE_PTHREAD_RESULT(result);
} else {
struct timespec ts;
ComputeTimeSpecMicros(&ts, micros);
int result = pthread_cond_timedwait(data_.cond(), data_.mutex(), &ts);
ASSERT((result == 0) || (result == ETIMEDOUT));
if (result == ETIMEDOUT) {
retval = kTimedOut;
}
}
return retval;
}
void Monitor::Notify() {
// TODO(iposva): Do we need to track lock owners?
int result = pthread_cond_signal(data_.cond());
VALIDATE_PTHREAD_RESULT(result);
}
void Monitor::NotifyAll() {
// TODO(iposva): Do we need to track lock owners?
int result = pthread_cond_broadcast(data_.cond());
VALIDATE_PTHREAD_RESULT(result);
}
} // namespace dart
#endif // defined(TARGET_OS_ANDROID)