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#include "Sync.h"
#if VST_HOST_SYSTEM == VST_WINDOWS
# ifndef NOMINMAX
# define NOMINMAX
# endif
# include <windows.h>
# include <malloc.h>
#else
# include <stdlib.h>
#endif
#include <climits>
namespace vst {
/*/////////////////// SyncCondition ////////////////////*/
SyncCondition::SyncCondition(){
#if VST_HOST_SYSTEM == VST_WINDOWS
InitializeConditionVariable((PCONDITION_VARIABLE)&condition_);
InitializeSRWLock((PSRWLOCK)&mutex_);
#else // pthreads
pthread_mutex_init(&mutex_, 0);
pthread_cond_init(&condition_, 0);
#endif
}
SyncCondition::~SyncCondition(){
#if VST_HOST_SYSTEM != VST_WINDOWS
pthread_mutex_destroy(&mutex_);
pthread_cond_destroy(&condition_);
#endif
}
void SyncCondition::set(){
#if VST_HOST_SYSTEM == VST_WINDOWS
AcquireSRWLockExclusive((PSRWLOCK)&mutex_);
state_ = true;
ReleaseSRWLockExclusive((PSRWLOCK)&mutex_);
WakeConditionVariable((PCONDITION_VARIABLE)&condition_);
#else
pthread_mutex_lock(&mutex_);
state_ = true;
pthread_mutex_unlock(&mutex_);
pthread_cond_signal(&condition_);
#endif
}
void SyncCondition::wait(){
#if VST_HOST_SYSTEM == VST_WINDOWS
AcquireSRWLockExclusive((PSRWLOCK)&mutex_);
while (!state_){
SleepConditionVariableSRW((PCONDITION_VARIABLE)&condition_,
(PSRWLOCK)&mutex_, INFINITE, 0);
}
state_ = false;
ReleaseSRWLockExclusive((PSRWLOCK)&mutex_);
#else
pthread_mutex_lock(&mutex_);
while (!state_){
pthread_cond_wait(&condition_, &mutex_);
}
state_ = false;
pthread_mutex_unlock(&mutex_);
#endif
}
/*/////////////////// Semaphore ////////////////////*/
Semaphore::Semaphore(){
#if VST_HOST_SYSTEM == VST_WINDOWS
sem_ = CreateSemaphoreA(0, 0, INT_MAX, 0);
#elif VST_HOST_SYSTEM == VST_MACOS
semaphore_create(mach_task_self(), &sem_, SYNC_POLICY_FIFO, 0);
#else // Linux
sem_init(&sem_, 0, 0);
#endif
}
Semaphore::~Semaphore(){
#if VST_HOST_SYSTEM == VST_WINDOWS
CloseHandle(sem_);
#elif VST_HOST_SYSTEM == VST_MACOS
semaphore_destroy(mach_task_self(), sem_);
#else // Linux
sem_destroy(&sem_);
#endif
}
void Semaphore::post(){
#if VST_HOST_SYSTEM == VST_WINDOWS
ReleaseSemaphore(sem_, 1, 0);
#elif VST_HOST_SYSTEM == VST_MACOS
semaphore_signal(sem_);
#else // Linux
sem_post(&sem_);
#endif
}
void Semaphore::post(int count){
#if VST_HOST_SYSTEM == VST_WINDOWS
ReleaseSemaphore(sem_, count, 0);
#else
for (int i = 0; i < count; ++i) {
post();
}
#endif
}
void Semaphore::wait(){
#if VST_HOST_SYSTEM == VST_WINDOWS
WaitForSingleObject(sem_, INFINITE);
#elif VST_HOST_SYSTEM == VST_MACOS
semaphore_wait(sem_);
#else // Linux
while (sem_wait(&sem_) == -1 && errno == EINTR) continue;
#endif
}
/*////////////////////// SharedMutex ///////////////////*/
#if VST_HOST_SYSTEM == VST_WINDOWS
Mutex::Mutex() {
InitializeSRWLock((PSRWLOCK)& lock_);
}
// exclusive
void Mutex::lock() {
AcquireSRWLockExclusive((PSRWLOCK)&lock_);
}
bool Mutex::try_lock() {
return TryAcquireSRWLockExclusive((PSRWLOCK)&lock_);
}
void Mutex::unlock() {
ReleaseSRWLockExclusive((PSRWLOCK)&lock_);
}
// shared
void SharedMutex::lock_shared() {
AcquireSRWLockShared((PSRWLOCK)&lock_);
}
bool SharedMutex::try_lock_shared() {
return TryAcquireSRWLockShared((PSRWLOCK)&lock_);
}
void SharedMutex::unlock_shared() {
ReleaseSRWLockShared((PSRWLOCK)&lock_);
}
#endif
} // vst
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