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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef prsem_h___ | |
| 7 #define prsem_h___ | |
| 8 | |
| 9 /* | |
| 10 ** API for counting semaphores. Semaphores are counting synchronizing | |
| 11 ** variables based on a lock and a condition variable. They are lightweight | |
| 12 ** contention control for a given count of resources. | |
| 13 */ | |
| 14 #include "prtypes.h" | |
| 15 | |
| 16 PR_BEGIN_EXTERN_C | |
| 17 | |
| 18 typedef struct PRSemaphore PRSemaphore; | |
| 19 | |
| 20 /* | |
| 21 ** Create a new semaphore object. | |
| 22 */ | |
| 23 NSPR_API(PRSemaphore*) PR_NewSem(PRUintn value); | |
| 24 | |
| 25 /* | |
| 26 ** Destroy the given semaphore object. | |
| 27 ** | |
| 28 */ | |
| 29 NSPR_API(void) PR_DestroySem(PRSemaphore *sem); | |
| 30 | |
| 31 /* | |
| 32 ** Wait on a Semaphore. | |
| 33 ** | |
| 34 ** This routine allows a calling thread to wait or proceed depending upon the | |
| 35 ** state of the semahore sem. The thread can proceed only if the counter value | |
| 36 ** of the semaphore sem is currently greater than 0. If the value of semaphore | |
| 37 ** sem is positive, it is decremented by one and the routine returns immediately
| |
| 38 ** allowing the calling thread to continue. If the value of semaphore sem is 0, | |
| 39 ** the calling thread blocks awaiting the semaphore to be released by another | |
| 40 ** thread. | |
| 41 ** | |
| 42 ** This routine can return PR_PENDING_INTERRUPT if the waiting thread | |
| 43 ** has been interrupted. | |
| 44 */ | |
| 45 NSPR_API(PRStatus) PR_WaitSem(PRSemaphore *sem); | |
| 46 | |
| 47 /* | |
| 48 ** This routine increments the counter value of the semaphore. If other threads | |
| 49 ** are blocked for the semaphore, then the scheduler will determine which ONE | |
| 50 ** thread will be unblocked. | |
| 51 */ | |
| 52 NSPR_API(void) PR_PostSem(PRSemaphore *sem); | |
| 53 | |
| 54 /* | |
| 55 ** Returns the value of the semaphore referenced by sem without affecting | |
| 56 ** the state of the semaphore. The value represents the semaphore vaule | |
| 57 F** at the time of the call, but may not be the actual value when the | |
| 58 ** caller inspects it. | |
| 59 */ | |
| 60 NSPR_API(PRUintn) PR_GetValueSem(PRSemaphore *sem); | |
| 61 | |
| 62 PR_END_EXTERN_C | |
| 63 | |
| 64 #endif /* prsem_h___ */ | |
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Chromium Code Reviews
Issue 2078763002:
Delete bundled copy of NSS and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/nss@master