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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* | |
| 3 * The contents of this file are subject to the Mozilla Public | |
| 4 * License Version 1.1 (the "License"); you may not use this file | |
| 5 * except in compliance with the License. You may obtain a copy of | |
| 6 * the License at http://www.mozilla.org/MPL/ | |
| 7 * | |
| 8 * Software distributed under the License is distributed on an "AS | |
| 9 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or | |
| 10 * implied. See the License for the specific language governing | |
| 11 * rights and limitations under the License. | |
| 12 * | |
| 13 * The Original Code is the Netscape Portable Runtime (NSPR). | |
| 14 * | |
| 15 * The Initial Developer of the Original Code is Netscape | |
| 16 * Communications Corporation. Portions created by Netscape are | |
| 17 * Copyright (C) 1998-2000 Netscape Communications Corporation. All | |
| 18 * Rights Reserved. | |
| 19 * | |
| 20 * Contributor(s): | |
| 21 * | |
| 22 * Alternatively, the contents of this file may be used under the | |
| 23 * terms of the GNU General Public License Version 2 or later (the | |
| 24 * "GPL"), in which case the provisions of the GPL are applicable | |
| 25 * instead of those above. If you wish to allow use of your | |
| 26 * version of this file only under the terms of the GPL and not to | |
| 27 * allow others to use your version of this file under the MPL, | |
| 28 * indicate your decision by deleting the provisions above and | |
| 29 * replace them with the notice and other provisions required by | |
| 30 * the GPL. If you do not delete the provisions above, a recipient | |
| 31 * may use your version of this file under either the MPL or the | |
| 32 * GPL. | |
| 33 */ | |
| 34 | |
| 35 #ifndef prsem_h___ | |
| 36 #define prsem_h___ | |
| 37 | |
| 38 /* | |
| 39 ** API for counting semaphores. Semaphores are counting synchronizing | |
| 40 ** variables based on a lock and a condition variable. They are lightweight | |
| 41 ** contention control for a given count of resources. | |
| 42 */ | |
| 43 #include "prtypes.h" | |
| 44 | |
| 45 PR_BEGIN_EXTERN_C | |
| 46 | |
| 47 typedef struct PRSemaphore PRSemaphore; | |
| 48 | |
| 49 /* | |
| 50 ** Create a new semaphore object. | |
| 51 */ | |
| 52 NSPR_API(PRSemaphore*) PR_NewSem(PRUintn value); | |
| 53 | |
| 54 /* | |
| 55 ** Destroy the given semaphore object. | |
| 56 ** | |
| 57 */ | |
| 58 NSPR_API(void) PR_DestroySem(PRSemaphore *sem); | |
| 59 | |
| 60 /* | |
| 61 ** Wait on a Semaphore. | |
| 62 ** | |
| 63 ** This routine allows a calling thread to wait or proceed depending upon the | |
| 64 ** state of the semahore sem. The thread can proceed only if the counter value | |
| 65 ** of the semaphore sem is currently greater than 0. If the value of semaphore | |
| 66 ** sem is positive, it is decremented by one and the routine returns immediately
| |
| 67 ** allowing the calling thread to continue. If the value of semaphore sem is 0, | |
| 68 ** the calling thread blocks awaiting the semaphore to be released by another | |
| 69 ** thread. | |
| 70 ** | |
| 71 ** This routine can return PR_PENDING_INTERRUPT if the waiting thread | |
| 72 ** has been interrupted. | |
| 73 */ | |
| 74 NSPR_API(PRStatus) PR_WaitSem(PRSemaphore *sem); | |
| 75 | |
| 76 /* | |
| 77 ** This routine increments the counter value of the semaphore. If other threads | |
| 78 ** are blocked for the semaphore, then the scheduler will determine which ONE | |
| 79 ** thread will be unblocked. | |
| 80 */ | |
| 81 NSPR_API(void) PR_PostSem(PRSemaphore *sem); | |
| 82 | |
| 83 /* | |
| 84 ** Returns the value of the semaphore referenced by sem without affecting | |
| 85 ** the state of the semaphore. The value represents the semaphore vaule | |
| 86 F** at the time of the call, but may not be the actual value when the | |
| 87 ** caller inspects it. | |
| 88 */ | |
| 89 NSPR_API(PRUintn) PR_GetValueSem(PRSemaphore *sem); | |
| 90 | |
| 91 PR_END_EXTERN_C | |
| 92 | |
| 93 #endif /* prsem_h___ */ | |
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Chromium Code Reviews
Issue 665543002:
Remove third_party/npapi/npspy. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master