posix semaphores not working under gdb

[Jim Blandy]

Interesting: POSIX says, of thread_mutex_lock ( ),
pthread_mutex_trylock ( ), and pthread_mutex_unlock ( ):

34138      These functions shall not return an error code of [EINTR].

But of sem_wait ():
39299            The sem_trywait ( ) and sem_wait ( ) functions may fail if:
...
39301            [EINTR]             A signal interrupted this function.