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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
semaphore.h(0P) POSIX Programmer's Manual semaphore.h(0P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
semaphore.h — semaphores
#include <semaphore.h>
The <semaphore.h> header shall define the sem_t type, used in
performing semaphore operations. The semaphore may be implemented
using a file descriptor, in which case applications are able to open
up at least a total of {OPEN_MAX} files and semaphores.
The <semaphore.h> header shall define the symbolic constant
SEM_FAILED which shall have type sem_t *.
The following shall be declared as functions and may also be defined
as macros. Function prototypes shall be provided.
int sem_close(sem_t *);
int sem_destroy(sem_t *);
int sem_getvalue(sem_t *restrict, int *restrict);
int sem_init(sem_t *, int, unsigned);
sem_t *sem_open(const char *, int, ...);
int sem_post(sem_t *);
int sem_timedwait(sem_t *restrict, const struct timespec *restrict);
int sem_trywait(sem_t *);
int sem_unlink(const char *);
int sem_wait(sem_t *);
Inclusion of the <semaphore.h> header may make visible symbols
defined in the <fcntl.h> and <time.h> headers.
The following sections are informative.
None.
None.
None.
fcntl.h(0p), sys_types.h(0p), time.h(0p)
The System Interfaces volume of POSIX.1‐2008, sem_close(3p),
sem_destroy(3p), sem_getvalue(3p), sem_init(3p), sem_open(3p),
sem_post(3p), sem_timedwait(3p), sem_trywait(3p), sem_unlink(3p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 semaphore.h(0P)
Pages that refer to this page: spawn.h(0p), sem_close(3p), sem_destroy(3p), sem_getvalue(3p), sem_init(3p), sem_open(3p), sem_post(3p), sem_timedwait(3p), sem_trywait(3p), sem_unlink(3p)