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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#include "pal_config.h"
#include "pal_threading.h"
#include <limits.h>
#include <sched.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#if defined(TARGET_OSX)
// So we can use the declaration of pthread_cond_timedwait_relative_np
#undef _XOPEN_SOURCE
#endif
#include <pthread.h>
#if defined(TARGET_OSX)
#define _XOPEN_SOURCE
#endif
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// LowLevelMonitor - Represents a non-recursive mutex and condition
struct LowLevelMonitor
{
pthread_mutex_t Mutex;
pthread_cond_t Condition;
#ifdef DEBUG
bool IsLocked;
#endif
};
static void SetIsLocked(LowLevelMonitor* monitor, bool isLocked)
{
#ifdef DEBUG
assert(monitor->IsLocked != isLocked);
monitor->IsLocked = isLocked;
#else
(void)monitor; // unused in release build
(void)isLocked; // unused in release build
#endif
}
LowLevelMonitor* SystemNative_LowLevelMonitor_Create()
{
LowLevelMonitor* monitor = (LowLevelMonitor *)malloc(sizeof(LowLevelMonitor));
if (monitor == NULL)
{
return NULL;
}
int error;
error = pthread_mutex_init(&monitor->Mutex, NULL);
if (error != 0)
{
free(monitor);
return NULL;
}
#if HAVE_PTHREAD_CONDATTR_SETCLOCK && HAVE_CLOCK_MONOTONIC
pthread_condattr_t conditionAttributes;
error = pthread_condattr_init(&conditionAttributes);
if (error != 0)
{
goto mutex_destroy;
}
error = pthread_condattr_setclock(&conditionAttributes, CLOCK_MONOTONIC);
if (error != 0)
{
error = pthread_condattr_destroy(&conditionAttributes);
assert(error == 0);
goto mutex_destroy;
}
error = pthread_cond_init(&monitor->Condition, &conditionAttributes);
int condAttrDestroyError = pthread_condattr_destroy(&conditionAttributes);
assert(condAttrDestroyError == 0);
(void)condAttrDestroyError; // unused in release build
#else
error = pthread_cond_init(&monitor->Condition, NULL);
#endif
if (error != 0)
{
goto mutex_destroy;
}
#ifdef DEBUG
monitor->IsLocked = false;
#endif
return monitor;
mutex_destroy:
error = pthread_mutex_destroy(&monitor->Mutex);
assert(error == 0);
free(monitor);
return NULL;
}
void SystemNative_LowLevelMonitor_Destroy(LowLevelMonitor* monitor)
{
assert(monitor != NULL);
int error;
error = pthread_cond_destroy(&monitor->Condition);
assert(error == 0);
error = pthread_mutex_destroy(&monitor->Mutex);
assert(error == 0);
(void)error; // unused in release build
free(monitor);
}
void SystemNative_LowLevelMonitor_Acquire(LowLevelMonitor* monitor)
{
assert(monitor != NULL);
int error = pthread_mutex_lock(&monitor->Mutex);
assert(error == 0);
(void)error; // unused in release build
SetIsLocked(monitor, true);
}
void SystemNative_LowLevelMonitor_Release(LowLevelMonitor* monitor)
{
assert(monitor != NULL);
SetIsLocked(monitor, false);
int error = pthread_mutex_unlock(&monitor->Mutex);
assert(error == 0);
(void)error; // unused in release build
}
void SystemNative_LowLevelMonitor_Wait(LowLevelMonitor* monitor)
{
assert(monitor != NULL);
SetIsLocked(monitor, false);
int error = pthread_cond_wait(&monitor->Condition, &monitor->Mutex);
assert(error == 0);
(void)error; // unused in release build
SetIsLocked(monitor, true);
}
int32_t SystemNative_LowLevelMonitor_TimedWait(LowLevelMonitor *monitor, int32_t timeoutMilliseconds)
{
assert(timeoutMilliseconds >= 0);
SetIsLocked(monitor, false);
int error;
// Calculate the time at which a timeout should occur, and wait. Older versions of OSX don't support clock_gettime with
// CLOCK_MONOTONIC, so we instead compute the relative timeout duration, and use a relative variant of the timed wait.
struct timespec timeoutTimeSpec;
#if HAVE_CLOCK_GETTIME_NSEC_NP
timeoutTimeSpec.tv_sec = timeoutMilliseconds / 1000;
timeoutTimeSpec.tv_nsec = (timeoutMilliseconds % 1000) * 1000 * 1000;
error = pthread_cond_timedwait_relative_np(&monitor->Condition, &monitor->Mutex, &timeoutTimeSpec);
#else
#if HAVE_CLOCK_MONOTONIC
error = clock_gettime(CLOCK_MONOTONIC, &timeoutTimeSpec);
assert(error == 0);
#else
struct timeval tv;
error = gettimeofday(&tv, NULL);
assert(error == 0);
timeoutTimeSpec.tv_sec = tv.tv_sec;
timeoutTimeSpec.tv_nsec = tv.tv_usec * 1000;
#endif
uint64_t nanoseconds = (uint64_t)timeoutMilliseconds * 1000 * 1000 + (uint64_t)timeoutTimeSpec.tv_nsec;
timeoutTimeSpec.tv_sec += nanoseconds / (1000 * 1000 * 1000);
timeoutTimeSpec.tv_nsec = nanoseconds % (1000 * 1000 * 1000);
error = pthread_cond_timedwait(&monitor->Condition, &monitor->Mutex, &timeoutTimeSpec);
#endif
assert(error == 0 || error == ETIMEDOUT);
SetIsLocked(monitor, true);
return error == 0;
}
void SystemNative_LowLevelMonitor_Signal_Release(LowLevelMonitor* monitor)
{
assert(monitor != NULL);
int error;
error = pthread_cond_signal(&monitor->Condition);
assert(error == 0);
SetIsLocked(monitor, false);
error = pthread_mutex_unlock(&monitor->Mutex);
assert(error == 0);
(void)error; // unused in release build
}
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