Minimal naïve critical-section and some atomic operations multiplatform

cs_atomic.c

#ifdef _MSC_VER
typedef struct flt_critsec
{
  CRITICAL_SECTION cs;
}flt_critsec;

flt_critsec* flt_critsec_create()
{
  flt_critsec* cs=(flt_critsec*)flt_malloc(sizeof(flt_critsec));
  InitializeCriticalSection(&cs->cs);
  return cs;
}

void flt_critsec_destroy(flt_critsec* cs)
{
  DeleteCriticalSection(&cs->cs);
  flt_free(cs);
}

void flt_critsec_enter(flt_critsec* cs)
{
  EnterCriticalSection(&cs->cs);
}

void flt_critsec_leave(flt_critsec* cs)
{
  LeaveCriticalSection(&cs->cs);
}

long flt_atomic_dec(fltatom32* c)
{
  return InterlockedDecrement(c);
}

long flt_atomic_inc(fltatom32* c)
{
  return InterlockedIncrement(c);
}

#else // perhaps pthread/gcc builtings to the rescue?

typedef struct flt_critsec
{
  pthread_mutex_t mtx;
}flt_critsec;

flt_critsec* flt_critsec_create()
{
  flt_critsec* cs;
  cs=(flt_critsec*)flt_malloc(sizeof(flt_critsec));
  pthread_mutex_init(&cs->mtx, ... );
  return cs;
}

void flt_critsec_destroy(flt_critsec* cs)
{
  pthread_mutex_destroy(&cs->mtx);
  flt_free(cs);
}

void flt_critsec_enter(flt_critsec* cs)
{
  pthread_mutex_lock(&cs->mtx);
}

void flt_critsec_leave(flt_critsec* cs)
{
  pthread_mutex_unlock(&cs->mtx);
}

long flt_atomic_dec(fltatom32* c)
{
  return __sync_sub_and_fetch(c,1);
}

long flt_atomic_inc(fltatom32* c)
{
  return __sync_add_and_fetch(c,1);
}
#endif