SEM_INIT(3) | Library Functions Manual | SEM_INIT(3) |
sem_init
—
#include <semaphore.h>
int
sem_init
(sem_t
*sem, int pshared,
unsigned int value);
sem_init
() function initializes the unnamed
semaphore pointed to by sem to have the value
value. A non-zero value for
pshared specifies a shared semaphore that can be used by
multiple processes.
Following a successful call to sem_init
(),
sem can be used as an argument in subsequent calls to
sem_wait
(), sem_timedwait
(),
sem_trywait
(), sem_post
(),
and sem_destroy
(). sem is no
longer valid after a successful call to
sem_destroy.
sem_init
() function returns the value 0 if
successful; otherwise the value -1 is returned and the global variable
errno is set to indicate the error.
sem_init
() will fail if:
sem_init
() conforms to ISO/IEC
9945-1:1996 (“POSIX.1”).
February 21, 2019 | NetBSD 9.2 |