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#ifdef WIN32
#include "../common/winapi.h"
#else
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
#endif
#include "../common/cbasetypes.h"
#include "../common/malloc.h"
#include "../common/showmsg.h"
#include "../common/timer.h"
#include "../common/mutex.h"
struct ramutex{
#ifdef WIN32
CRITICAL_SECTION hMutex;
#else
pthread_mutex_t hMutex;
#endif
};
struct racond{
#ifdef WIN32
HANDLE events[2];
ra_align(8) volatile LONG nWaiters;
CRITICAL_SECTION waiters_lock;
#define EVENT_COND_SIGNAL 0
#define EVENT_COND_BROADCAST 1
#else
pthread_cond_t hCond;
#endif
};
////////////////////
// Mutex
//
// Implementation:
//
ramutex ramutex_create(){
struct ramutex *m;
m = (struct ramutex*)aMalloc( sizeof(struct ramutex) );
if(m == NULL){
ShowFatalError("ramutex_create: OOM while allocating %u bytes.\n", sizeof(struct ramutex));
return NULL;
}
#ifdef WIN32
InitializeCriticalSection(&m->hMutex);
#else
pthread_mutex_init(&m->hMutex, NULL);
#endif
return m;
}//end: ramutex_create()
void ramutex_destroy( ramutex m ){
#ifdef WIN32
DeleteCriticalSection(&m->hMutex);
#else
pthread_mutex_destroy(&m->hMutex);
#endif
aFree(m);
}//end: ramutex_destroy()
void ramutex_lock( ramutex m ){
#ifdef WIN32
EnterCriticalSection(&m->hMutex);
#else
pthread_mutex_lock(&m->hMutex);
#endif
}//end: ramutex_lock
bool ramutex_trylock( ramutex m ){
#ifdef WIN32
if(TryEnterCriticalSection(&m->hMutex) == TRUE)
return true;
return false;
#else
if(pthread_mutex_trylock(&m->hMutex) == 0)
return true;
return false;
#endif
}//end: ramutex_trylock()
void ramutex_unlock( ramutex m ){
#ifdef WIN32
LeaveCriticalSection(&m->hMutex);
#else
pthread_mutex_unlock(&m->hMutex);
#endif
}//end: ramutex_unlock()
///////////////
// Condition Variables
//
// Implementation:
//
racond racond_create(){
struct racond *c;
c = (struct racond*)aMalloc( sizeof(struct racond) );
if(c == NULL){
ShowFatalError("racond_create: OOM while allocating %u bytes\n", sizeof(struct racond));
return NULL;
}
#ifdef WIN32
c->nWaiters = 0;
c->events[ EVENT_COND_SIGNAL ] = CreateEvent( NULL, FALSE, FALSE, NULL );
c->events[ EVENT_COND_BROADCAST ] = CreateEvent( NULL, TRUE, FALSE, NULL );
#else
pthread_cond_init(&c->hCond, NULL);
#endif
return c;
}//end: racond_create()
void racond_destroy( racond c ){
#ifdef WIN32
CloseHandle( c->events[ EVENT_COND_SIGNAL ] );
CloseHandle( c->events[ EVENT_COND_BROADCAST ] );
InitializeCriticalSection( &c->waiters_lock );
#else
pthread_cond_destroy(&c->hCond);
#endif
aFree(c);
}//end: racond_destroy()
void racond_wait( racond c, ramutex m, sysint timeout_ticks){
#ifdef WIN32
register DWORD ms;
int result;
bool is_last = false;
EnterCriticalSection(&c->waiters_lock);
c->nWaiters++;
LeaveCriticalSection(&c->waiters_lock);
if(timeout_ticks < 0)
ms = INFINITE;
else
ms = (timeout_ticks > MAXDWORD) ? (MAXDWORD - 1) : (DWORD)timeout_ticks;
// we can release the mutex (m) here, cause win's
// manual reset events maintain state when used with
// SetEvent()
ramutex_unlock(m);
result = WaitForMultipleObjects(2, c->events, FALSE, ms);
EnterCriticalSection(&c->waiters_lock);
c->nWaiters--;
if( (result == WAIT_OBJECT_0 + EVENT_COND_BROADCAST) && (c->nWaiters == 0) )
is_last = true; // Broadcast called!
LeaveCriticalSection(&c->waiters_lock);
// we are the last waiter that has to be notified, or to stop waiting
// so we have to do a manual reset
if(is_last == true)
ResetEvent( c->events[EVENT_COND_BROADCAST] );
ramutex_lock(m);
#else
if(timeout_ticks < 0){
pthread_cond_wait( &c->hCond, &m->hMutex );
}else{
struct timespec wtime;
int64 exact_timeout = gettick() + timeout_ticks;
wtime.tv_sec = exact_timeout/1000;
wtime.tv_nsec = (exact_timeout%1000)*1000000;
pthread_cond_timedwait( &c->hCond, &m->hMutex, &wtime);
}
#endif
}//end: racond_wait()
void racond_signal( racond c ){
#ifdef WIN32
// bool has_waiters = false;
// EnterCriticalSection(&c->waiters_lock);
// if(c->nWaiters > 0)
// has_waiters = true;
// LeaveCriticalSection(&c->waiters_lock);
// if(has_waiters == true)
SetEvent( c->events[ EVENT_COND_SIGNAL ] );
#else
pthread_cond_signal(&c->hCond);
#endif
}//end: racond_signal()
void racond_broadcast( racond c ){
#ifdef WIN32
// bool has_waiters = false;
// EnterCriticalSection(&c->waiters_lock);
// if(c->nWaiters > 0)
// has_waiters = true;
// LeaveCriticalSection(&c->waiters_lock);
// if(has_waiters == true)
SetEvent( c->events[ EVENT_COND_BROADCAST ] );
#else
pthread_cond_broadcast(&c->hCond);
#endif
}//end: racond_broadcast()
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