mirror of git://sourceware.org/git/glibc.git
52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
@node Inter-Process Communication, Job Control, Processes, Top
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@c %MENU% All about inter-process communication
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@chapter Inter-Process Communication
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@cindex ipc
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This chapter describes the @glibcadj{} inter-process communication primitives.
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@menu
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* Semaphores:: Support for creating and managing semaphores
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@end menu
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@node Semaphores
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@section Semaphores
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@Theglibc{} implements the semaphore APIs as defined in POSIX and
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System V. Semaphores can be used by multiple processes to coordinate shared
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resources. The following is a complete list of the semaphore functions provided
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by @theglibc{}.
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@c Need descriptions for all of these functions.
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@subsection System V Semaphores
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@deftypefun int semctl (int @var{semid}, int @var{semnum}, int @var{cmd})
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@safety{@prelim{}@mtsafe{}@assafe{}@acunsafe{@acucorrupt{/linux}}}
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@c syscall(ipc) ok
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@c
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@c AC-unsafe because we need to translate the new kernel
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@c semid_ds buf into the userspace layout. Cancellation
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@c at that point results in an inconsistent userspace
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@c semid_ds.
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@end deftypefun
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@deftypefun int semget (key_t @var{key}, int @var{nsems}, int @var{semflg})
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@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
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@c syscall(ipc) ok
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@end deftypefun
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@deftypefun int semop (int @var{semid}, struct sembuf *@var{sops}, size_t @var{nsops})
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@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
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@c syscall(ipc) ok
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@end deftypefun
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@deftypefun int semtimedop (int @var{semid}, struct sembuf *@var{sops}, size_t @var{nsops}, const struct timespec *@var{timeout})
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@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
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@c syscall(ipc) ok
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@end deftypefun
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@subsection POSIX Semaphores
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@Theglibc{} provides POSIX semaphores as well. These functions' names begin
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with @code{sem_} and they are declared in @file{semaphore.h}. @xref{POSIX
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Semaphores}.
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