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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) 1999-2000 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 /* | |
| 36 * File: pripcsem.h | |
| 37 * | |
| 38 * Description: named semaphores for interprocess | |
| 39 * synchronization | |
| 40 * | |
| 41 * Unrelated processes obtain access to a shared semaphore | |
| 42 * by specifying its name. | |
| 43 * | |
| 44 * Our goal is to support named semaphores on at least | |
| 45 * Unix and Win32 platforms. The implementation will use | |
| 46 * one of the three native semaphore APIs: POSIX, System V, | |
| 47 * and Win32. | |
| 48 * | |
| 49 * Because POSIX named semaphores have kernel persistence, | |
| 50 * we are forced to have a delete function in this API. | |
| 51 */ | |
| 52 | |
| 53 #ifndef pripcsem_h___ | |
| 54 #define pripcsem_h___ | |
| 55 | |
| 56 #include "prtypes.h" | |
| 57 #include "prio.h" | |
| 58 | |
| 59 PR_BEGIN_EXTERN_C | |
| 60 | |
| 61 /* | |
| 62 * PRSem is an opaque structure that represents a named | |
| 63 * semaphore. | |
| 64 */ | |
| 65 typedef struct PRSem PRSem; | |
| 66 | |
| 67 /* | |
| 68 * PR_OpenSemaphore -- | |
| 69 * | |
| 70 * Create or open a named semaphore with the specified name. | |
| 71 * A handle to the semaphore is returned. | |
| 72 * | |
| 73 * If the named semaphore doesn't exist and the PR_SEM_CREATE | |
| 74 * flag is specified, the named semaphore is created. The | |
| 75 * created semaphore needs to be removed from the system with | |
| 76 * a PR_DeleteSemaphore call. | |
| 77 * | |
| 78 * If PR_SEM_CREATE is specified, the third argument is the | |
| 79 * access permission bits of the new semaphore (same | |
| 80 * interpretation as the mode argument to PR_Open) and the | |
| 81 * fourth argument is the initial value of the new semaphore. | |
| 82 * If PR_SEM_CREATE is not specified, the third and fourth | |
| 83 * arguments are ignored. | |
| 84 */ | |
| 85 | |
| 86 #define PR_SEM_CREATE 0x1 /* create if not exist */ | |
| 87 #define PR_SEM_EXCL 0x2 /* fail if already exists */ | |
| 88 | |
| 89 NSPR_API(PRSem *) PR_OpenSemaphore( | |
| 90 const char *name, PRIntn flags, PRIntn mode, PRUintn value); | |
| 91 | |
| 92 /* | |
| 93 * PR_WaitSemaphore -- | |
| 94 * | |
| 95 * If the value of the semaphore is > 0, decrement the value and return. | |
| 96 * If the value is 0, sleep until the value becomes > 0, then decrement | |
| 97 * the value and return. | |
| 98 * | |
| 99 * The "test and decrement" operation is performed atomically. | |
| 100 */ | |
| 101 | |
| 102 NSPR_API(PRStatus) PR_WaitSemaphore(PRSem *sem); | |
| 103 | |
| 104 /* | |
| 105 * PR_PostSemaphore -- | |
| 106 * | |
| 107 * Increment the value of the named semaphore by 1. | |
| 108 */ | |
| 109 | |
| 110 NSPR_API(PRStatus) PR_PostSemaphore(PRSem *sem); | |
| 111 | |
| 112 /* | |
| 113 * PR_CloseSemaphore -- | |
| 114 * | |
| 115 * Close a named semaphore handle. | |
| 116 */ | |
| 117 | |
| 118 NSPR_API(PRStatus) PR_CloseSemaphore(PRSem *sem); | |
| 119 | |
| 120 /* | |
| 121 * PR_DeleteSemaphore -- | |
| 122 * | |
| 123 * Remove a named semaphore from the system. | |
| 124 */ | |
| 125 | |
| 126 NSPR_API(PRStatus) PR_DeleteSemaphore(const char *name); | |
| 127 | |
| 128 PR_END_EXTERN_C | |
| 129 | |
| 130 #endif /* pripcsem_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