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annotate nspr/pr/include/obsolete/prsem.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef prsem_h___
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7 #define prsem_h___
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8
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9 /*
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10 ** API for counting semaphores. Semaphores are counting synchronizing
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11 ** variables based on a lock and a condition variable. They are lightweight
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12 ** contention control for a given count of resources.
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13 */
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14 #include "prtypes.h"
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15
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16 PR_BEGIN_EXTERN_C
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17
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18 typedef struct PRSemaphore PRSemaphore;
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19
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20 /*
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21 ** Create a new semaphore object.
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22 */
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23 NSPR_API(PRSemaphore*) PR_NewSem(PRUintn value);
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24
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25 /*
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26 ** Destroy the given semaphore object.
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27 **
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28 */
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29 NSPR_API(void) PR_DestroySem(PRSemaphore *sem);
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30
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31 /*
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32 ** Wait on a Semaphore.
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33 **
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34 ** This routine allows a calling thread to wait or proceed depending upon the
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35 ** state of the semahore sem. The thread can proceed only if the counter value
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36 ** of the semaphore sem is currently greater than 0. If the value of semaphore
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37 ** sem is positive, it is decremented by one and the routine returns immediately
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38 ** allowing the calling thread to continue. If the value of semaphore sem is 0,
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39 ** the calling thread blocks awaiting the semaphore to be released by another
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40 ** thread.
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41 **
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42 ** This routine can return PR_PENDING_INTERRUPT if the waiting thread
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43 ** has been interrupted.
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44 */
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45 NSPR_API(PRStatus) PR_WaitSem(PRSemaphore *sem);
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46
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47 /*
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48 ** This routine increments the counter value of the semaphore. If other threads
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49 ** are blocked for the semaphore, then the scheduler will determine which ONE
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50 ** thread will be unblocked.
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51 */
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52 NSPR_API(void) PR_PostSem(PRSemaphore *sem);
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53
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54 /*
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55 ** Returns the value of the semaphore referenced by sem without affecting
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56 ** the state of the semaphore. The value represents the semaphore vaule
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57 F** at the time of the call, but may not be the actual value when the
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58 ** caller inspects it.
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59 */
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60 NSPR_API(PRUintn) PR_GetValueSem(PRSemaphore *sem);
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61
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62 PR_END_EXTERN_C
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63
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64 #endif /* prsem_h___ */
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