mirror of https://github.com/mkerrisk/man-pages
68 lines
2.3 KiB
Plaintext
68 lines
2.3 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "<semaphore.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" <semaphore.h>
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.SH NAME
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semaphore.h \- semaphores (\fBREALTIME\fP)
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.SH SYNOPSIS
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.LP
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\fB#include <semaphore.h> \fP
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.SH DESCRIPTION
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.LP
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The \fI<semaphore.h>\fP header shall define the \fBsem_t\fP type,
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used in performing semaphore operations. The semaphore
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may be implemented using a file descriptor, in which case applications
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are able to open up at least a total of {OPEN_MAX} files and
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semaphores. The symbol SEM_FAILED shall be defined (see \fIsem_open\fP()).
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.LP
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The following shall be declared as functions and may also be defined
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as macros. Function prototypes shall be provided.
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.sp
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.RS
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.nf
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\fBint sem_close(sem_t *);
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int sem_destroy(sem_t *);
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int sem_getvalue(sem_t *restrict, int *restrict);
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int sem_init(sem_t *, int, unsigned);
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sem_t *sem_open(const char *, int, ...);
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int sem_post(sem_t *);
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int sem_timedwait(sem_t *restrict, const struct timespec *restrict);
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int sem_trywait(sem_t *);
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int sem_unlink(const char *);
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int sem_wait(sem_t *);
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\fP
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.fi
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.RE
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.LP
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Inclusion of the \fI<semaphore.h>\fP header may make visible symbols
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defined in the headers \fI<fcntl.h>\fP and \fI<sys/types.h>\fP.
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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None.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fI<fcntl.h>\fP , \fI<sys/types.h>\fP , the System
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Interfaces volume of IEEE\ Std\ 1003.1-2001, \fIsem_destroy\fP(),
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\fIsem_getvalue\fP(), \fIsem_init\fP(), \fIsem_open\fP(), \fIsem_post\fP(),
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\fIsem_timedwait\fP(), \fIsem_trywait\fP(), \fIsem_unlink\fP(), \fIsem_wait\fP()
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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