Lock the pthread_sleepon* functions
#include <pthread.h> int pthread_sleepon_lock( void );
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The pthread_sleepon_lock() function calls pthread_mutex_lock() on a mutex associated with the pthread_sleepon* class of functions. You should call this function before testing conditions that determine whether you need to call pthread_sleepon_wait(), pthread_sleepon_signal(), or pthread_sleepon_broadcast(). This mutex prevents other threads from changing the conditions between the time you examine and act upon them.
This function may be implemented as a simple macro.
- The calling thread already owns the controlling mutex.
- On the first use of pthread_sleepon_lock(), all kernel mutex objects were in use.