thread_sdl.c

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#include <SDL.h>
#include <SDL_thread.h>
#include "quakedef.h"
#include "thread.h"
 
int Thread_Init(void)
{
#ifdef THREADDISABLE
    Con_Printf("Threading disabled in this build\n");
#endif
    return 0;
}
 
void Thread_Shutdown(void)
{
}
 
qbool Thread_HasThreads(void)
{
#ifdef THREADDISABLE
    return false;
#else
    return true;
#endif
}
 
void *_Thread_CreateMutex(const char *filename, int fileline)
{
    void *mutex = SDL_CreateMutex();
#ifdef THREADDEBUG
    Sys_Printf("%p mutex create %s:%i\n" , mutex, filename, fileline);
#endif
    return mutex;
}
 
void _Thread_DestroyMutex(void *mutex, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p mutex destroy %s:%i\n", mutex, filename, fileline);
#endif
    SDL_DestroyMutex((SDL_mutex *)mutex);
}
 
int _Thread_LockMutex(void *mutex, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p mutex lock %s:%i\n"   , mutex, filename, fileline);
#endif
    return SDL_LockMutex((SDL_mutex *)mutex);
}
 
int _Thread_UnlockMutex(void *mutex, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p mutex unlock %s:%i\n" , mutex, filename, fileline);
#endif
    return SDL_UnlockMutex((SDL_mutex *)mutex);
}
 
void *_Thread_CreateCond(const char *filename, int fileline)
{
    void *cond = (void *)SDL_CreateCond();
#ifdef THREADDEBUG
    Sys_Printf("%p cond create %s:%i\n"   , cond, filename, fileline);
#endif
    return cond;
}
 
void _Thread_DestroyCond(void *cond, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p cond destroy %s:%i\n"   , cond, filename, fileline);
#endif
    SDL_DestroyCond((SDL_cond *)cond);
}
 
int _Thread_CondSignal(void *cond, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p cond signal %s:%i\n"   , cond, filename, fileline);
#endif
    return SDL_CondSignal((SDL_cond *)cond);
}
 
int _Thread_CondBroadcast(void *cond, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p cond broadcast %s:%i\n"   , cond, filename, fileline);
#endif
    return SDL_CondBroadcast((SDL_cond *)cond);
}
 
int _Thread_CondWait(void *cond, void *mutex, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p cond wait %s:%i\n"   , cond, filename, fileline);
#endif
    return SDL_CondWait((SDL_cond *)cond, (SDL_mutex *)mutex);
}
 
void *_Thread_CreateThread(int (*fn)(void *), void *data, const char *filename, int fileline)
{
    void *thread = (void *)SDL_CreateThread(fn, filename, data);
#ifdef THREADDEBUG
    Sys_Printf("%p thread create %s:%i\n"   , thread, filename, fileline);
#endif
    return thread;
}
 
int _Thread_WaitThread(void *thread, int retval, const char *filename, int fileline)
{
    int status = retval;
#ifdef THREADDEBUG
    Sys_Printf("%p thread wait %s:%i\n"   , thread, filename, fileline);
#endif
    SDL_WaitThread((SDL_Thread *)thread, &status);
    return status;
}
 
// standard barrier implementation using conds and mutexes
// see: http://www.howforge.com/implementing-barrier-in-pthreads
typedef struct {
    unsigned int needed;
    unsigned int called;
    void *mutex;
    void *cond;
} barrier_t;
 
void *_Thread_CreateBarrier(unsigned int count, const char *filename, int fileline)
{
    volatile barrier_t *b = (volatile barrier_t *) Z_Malloc(sizeof(barrier_t));
#ifdef THREADDEBUG
    Sys_Printf("%p barrier create(%d) %s:%i\n", b, count, filename, fileline);
#endif
    b->needed = count;
    b->called = 0;
    b->mutex = Thread_CreateMutex();
    b->cond = Thread_CreateCond();
    return (void *) b;
}
 
void _Thread_DestroyBarrier(void *barrier, const char *filename, int fileline)
{
    volatile barrier_t *b = (volatile barrier_t *) barrier;
#ifdef THREADDEBUG
    Sys_Printf("%p barrier destroy %s:%i\n", b, filename, fileline);
#endif
    Thread_DestroyMutex(b->mutex);
    Thread_DestroyCond(b->cond);
}
 
void _Thread_WaitBarrier(void *barrier, const char *filename, int fileline)
{
    volatile barrier_t *b = (volatile barrier_t *) barrier;
#ifdef THREADDEBUG
    Sys_Printf("%p barrier wait %s:%i\n", b, filename, fileline);
#endif
    Thread_LockMutex(b->mutex);
    b->called++;
    if (b->called == b->needed) {
        b->called = 0;
        Thread_CondBroadcast(b->cond);
    } else {
        do {
            Thread_CondWait(b->cond, b->mutex);
        } while(b->called);
    }
    Thread_UnlockMutex(b->mutex);
}
 
int _Thread_AtomicGet(Thread_Atomic *a, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic get at %s:%i\n", a, filename, fileline);
#endif
    return SDL_AtomicGet((SDL_atomic_t *)a);
}
 
int _Thread_AtomicSet(Thread_Atomic *a, int v, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic set %v at %s:%i\n", a, v, filename, fileline);
#endif
    return SDL_AtomicSet((SDL_atomic_t *)a, v);
}
 
int _Thread_AtomicAdd(Thread_Atomic *a, int v, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic add %v at %s:%i\n", a, v, filename, fileline);
#endif
    return SDL_AtomicAdd((SDL_atomic_t *)a, v);
}
 
void _Thread_AtomicIncRef(Thread_Atomic *a, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic incref %s:%i\n", a, filename, fileline);
#endif
    SDL_AtomicIncRef((SDL_atomic_t *)a);
}
 
qbool _Thread_AtomicDecRef(Thread_Atomic *a, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic decref %s:%i\n", a, filename, fileline);
#endif
    return SDL_AtomicDecRef((SDL_atomic_t *)a) != SDL_FALSE;
}
 
qbool _Thread_AtomicTryLock(Thread_SpinLock *lock, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic try lock %s:%i\n", lock, filename, fileline);
#endif
    return SDL_AtomicTryLock(lock) != SDL_FALSE;
}
 
void _Thread_AtomicLock(Thread_SpinLock *lock, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic lock %s:%i\n", lock, filename, fileline);
#endif
    SDL_AtomicLock(lock);
}
 
void _Thread_AtomicUnlock(Thread_SpinLock *lock, const char *filename, int fileline)
{
#ifdef THREADDEBUG
    Sys_Printf("%p atomic unlock %s:%i\n", lock, filename, fileline);
#endif
    SDL_AtomicUnlock(lock);
}