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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 prcvar_h___ | |
| 36 #define prcvar_h___ | |
| 37 | |
| 38 #include "prlock.h" | |
| 39 #include "prinrval.h" | |
| 40 | |
| 41 PR_BEGIN_EXTERN_C | |
| 42 | |
| 43 typedef struct PRCondVar PRCondVar; | |
| 44 | |
| 45 /* | |
| 46 ** Create a new condition variable. | |
| 47 ** | |
| 48 ** "lock" is the lock used to protect the condition variable. | |
| 49 ** | |
| 50 ** Condition variables are synchronization objects that threads can use | |
| 51 ** to wait for some condition to occur. | |
| 52 ** | |
| 53 ** This may fail if memory is tight or if some operating system resource | |
| 54 ** is low. In such cases, a NULL will be returned. | |
| 55 */ | |
| 56 NSPR_API(PRCondVar*) PR_NewCondVar(PRLock *lock); | |
| 57 | |
| 58 /* | |
| 59 ** Destroy a condition variable. There must be no thread | |
| 60 ** waiting on the condvar. The caller is responsible for guaranteeing | |
| 61 ** that the condvar is no longer in use. | |
| 62 ** | |
| 63 */ | |
| 64 NSPR_API(void) PR_DestroyCondVar(PRCondVar *cvar); | |
| 65 | |
| 66 /* | |
| 67 ** The thread that waits on a condition is blocked in a "waiting on | |
| 68 ** condition" state until another thread notifies the condition or a | |
| 69 ** caller specified amount of time expires. The lock associated with | |
| 70 ** the condition variable will be released, which must have be held | |
| 71 ** prior to the call to wait. | |
| 72 ** | |
| 73 ** Logically a notified thread is moved from the "waiting on condition" | |
| 74 ** state and made "ready." When scheduled, it will attempt to reacquire | |
| 75 ** the lock that it held when wait was called. | |
| 76 ** | |
| 77 ** The timeout has two well known values, PR_INTERVAL_NO_TIMEOUT and | |
| 78 ** PR_INTERVAL_NO_WAIT. The former value requires that a condition be | |
| 79 ** notified (or the thread interrupted) before it will resume from the | |
| 80 ** wait. If the timeout has a value of PR_INTERVAL_NO_WAIT, the effect | |
| 81 ** is to release the lock, possibly causing a rescheduling within the | |
| 82 ** runtime, then immediately attempting to reacquire the lock and resume. | |
| 83 ** | |
| 84 ** Any other value for timeout will cause the thread to be rescheduled | |
| 85 ** either due to explicit notification or an expired interval. The latter | |
| 86 ** must be determined by treating time as one part of the monitored data | |
| 87 ** being protected by the lock and tested explicitly for an expired | |
| 88 ** interval. | |
| 89 ** | |
| 90 ** Returns PR_FAILURE if the caller has not locked the lock associated | |
| 91 ** with the condition variable or the thread was interrupted (PR_Interrupt()). | |
| 92 ** The particular reason can be extracted with PR_GetError(). | |
| 93 */ | |
| 94 NSPR_API(PRStatus) PR_WaitCondVar(PRCondVar *cvar, PRIntervalTime timeout); | |
| 95 | |
| 96 /* | |
| 97 ** Notify ONE thread that is currently waiting on 'cvar'. Which thread is | |
| 98 ** dependent on the implementation of the runtime. Common sense would dictate | |
| 99 ** that all threads waiting on a single condition have identical semantics, | |
| 100 ** therefore which one gets notified is not significant. | |
| 101 ** | |
| 102 ** The calling thead must hold the lock that protects the condition, as | |
| 103 ** well as the invariants that are tightly bound to the condition, when | |
| 104 ** notify is called. | |
| 105 ** | |
| 106 ** Returns PR_FAILURE if the caller has not locked the lock associated | |
| 107 ** with the condition variable. | |
| 108 */ | |
| 109 NSPR_API(PRStatus) PR_NotifyCondVar(PRCondVar *cvar); | |
| 110 | |
| 111 /* | |
| 112 ** Notify all of the threads waiting on the condition variable. The order | |
| 113 ** that the threads are notified is indeterminant. The lock that protects | |
| 114 ** the condition must be held. | |
| 115 ** | |
| 116 ** Returns PR_FAILURE if the caller has not locked the lock associated | |
| 117 ** with the condition variable. | |
| 118 */ | |
| 119 NSPR_API(PRStatus) PR_NotifyAllCondVar(PRCondVar *cvar); | |
| 120 | |
| 121 PR_END_EXTERN_C | |
| 122 | |
| 123 #endif /* prcvar_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