Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/system/newsem.c File Reference

#include <kernel.h>
#include <semaphore.h>

Include dependency graph for newsem.c:

Go to the source code of this file.

Functions
static semaphore	allocsem (void)
semaphore	newsem (short count)

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Detailed Description

newsem, allocsem

Id

newsem.c 217 2007-07-11 01:03:18Z brylow

Definition in file newsem.c.

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Function Documentation

static semaphore allocsem

(

void

)

[static]

allocsem - allocate an unused semaphore and return its index. Scan the global semaphore table for a free entry, mark the entry used, and return the new semaphore

Returns:

available semaphore id on success, SYSERR on failure

Definition at line 44 of file newsem.c.

References NSEM, semtab, SFREE, sentry::state, SUSED, and SYSERR.

Referenced by newsem().

semaphore newsem

(

short

count

)

newsem - allocate and initialize a new semaphore.

Parameters:

count

- number of resources available without waiting. example: count = 1 for mutual exclusion lock

Returns:

new semaphore id on success, SYSERR on failure

Definition at line 20 of file newsem.c.

References allocsem(), sentry::count, disable(), restore(), semtab, and SYSERR.

Referenced by test_deltaQueue(), test_procQueue(), test_semaphore(), test_semaphore2(), test_semaphore3(), test_semaphore4(), and uartInit().