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>XLVII. Semaphore and shared memory functions</H1
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>&#13;   This module provides semaphore functions using System V semaphores.
   Semaphores may be used to provide exclusive access to resources
   on the current machine, or to limit the number of processes that
   may simultaneously use a resource.</P
><P
>&#13;   This module provides also shared memory functions using System V
   shared memory. Shared memory may be used to provide access to
   global variables. Different httpd-daemons and even other programs
   (such as Perl, C, ...) are able to access this data to provide a
   global data-exchange. Remember, that shared memory is NOT safe
   against simultaneous access. Use semaphores for synchronization.

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>Table 1. Limits of shared memory by the Unix OS</B
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>SHMMAX</TD
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>max size of shared memory, normally 131072
	bytes</TD
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>SHMMIN</TD
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VALIGN="MIDDLE"
>minimum size of shared memory, normally 1 byte</TD
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>SHMMNI</TD
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>max amount of shared memory segments, normally
	100</TD
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>SHMSEG</TD
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>max amount of shared memory per process, normally
	6</TD
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><DT
><A
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>sem_get</A
> &#8212; get a semaphore id</DT
><DT
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HREF="function.sem-acquire.html"
>sem_acquire</A
> &#8212; acquire a semaphore</DT
><DT
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>sem_release</A
> &#8212; release a semaphore</DT
><DT
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HREF="function.shm-attach.html"
>shm_attach</A
> &#8212; Creates or open a shared memory segment</DT
><DT
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>shm_detach</A
> &#8212; Disconnects from shared memory segment</DT
><DT
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>shm_remove</A
> &#8212; Removes shared memory from Unix systems</DT
><DT
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>shm_put_var</A
> &#8212; Inserts or updates a variable in shared
     memory</DT
><DT
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>shm_get_var</A
> &#8212; Returns a variable from shared memory
    </DT
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>shm_remove_var</A
> &#8212; Removes a variable from shared memory
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