util_os.c - ogl_beamforming - Ultrasound Beamforming Implemented with OpenGL

util_os.c (564B)

      1 /* See LICENSE for license details. */
      2 
      3 // NOTE(rnp): functions which require platform layer support but
      4 // otherwise share implementation
      5 
      6 function b32
      7 take_lock(i32 *lock, i32 timeout_ms)
      8 {
      9 	b32 result = 0;
     10 	for (;;) {
     11 		i32 current = 0;
     12 		if (atomic_cas_u32(lock, &current, 1))
     13 			result = 1;
     14 		if (result || !timeout_ms || (!os_wait_on_address(lock, current, (u32)timeout_ms) && timeout_ms != -1))
     15 			break;
     16 	}
     17 	return result;
     18 }
     19 
     20 function void
     21 release_lock(i32 *lock)
     22 {
     23 	assert(atomic_load_u32(lock));
     24 	atomic_store_u32(lock, 0);
     25 	os_wake_all_waiters(lock);
     26 }