Mercurial > hg > graal-compiler
annotate src/os/windows/vm/threadCritical_windows.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_threadCritical_windows.cpp.incl" | |
| 27 | |
| 28 // OS-includes here | |
| 29 # include <windows.h> | |
| 30 # include <winbase.h> | |
| 31 | |
| 32 // | |
| 33 // See threadCritical.hpp for details of this class. | |
| 34 // | |
| 35 | |
| 36 static bool initialized = false; | |
| 37 static volatile jint lock_count = -1; | |
| 38 static HANDLE lock_event; | |
| 39 static DWORD lock_owner = -1; | |
| 40 | |
| 41 // | |
| 42 // Note that Microsoft's critical region code contains a race | |
| 43 // condition, and is not suitable for use. A thread holding the | |
| 44 // critical section cannot safely suspend a thread attempting | |
| 45 // to enter the critical region. The failure mode is that both | |
| 46 // threads are permanently suspended. | |
| 47 // | |
| 48 // I experiemented with the use of ordinary windows mutex objects | |
| 49 // and found them ~30 times slower than the critical region code. | |
| 50 // | |
| 51 | |
| 52 void ThreadCritical::initialize() { | |
| 53 } | |
| 54 | |
| 55 void ThreadCritical::release() { | |
| 56 assert(lock_owner == -1, "Mutex being deleted while owned."); | |
| 57 assert(lock_count == -1, "Mutex being deleted while recursively locked"); | |
| 58 assert(lock_event != NULL, "Sanity check"); | |
| 59 CloseHandle(lock_event); | |
| 60 } | |
| 61 | |
| 62 ThreadCritical::ThreadCritical() { | |
| 63 DWORD current_thread = GetCurrentThreadId(); | |
| 64 | |
| 65 if (lock_owner != current_thread) { | |
| 66 // Grab the lock before doing anything. | |
| 67 while (Atomic::cmpxchg(0, &lock_count, -1) != -1) { | |
| 68 if (initialized) { | |
| 69 DWORD ret = WaitForSingleObject(lock_event, INFINITE); | |
| 70 assert(ret == WAIT_OBJECT_0, "unexpected return value from WaitForSingleObject"); | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 // Make sure the event object is allocated. | |
| 75 if (!initialized) { | |
| 76 // Locking will not work correctly unless this is autoreset. | |
| 77 lock_event = CreateEvent(NULL, false, false, NULL); | |
| 78 initialized = true; | |
| 79 } | |
| 80 | |
| 81 assert(lock_owner == -1, "Lock acquired illegally."); | |
| 82 lock_owner = current_thread; | |
| 83 } else { | |
| 84 // Atomicity isn't required. Bump the recursion count. | |
| 85 lock_count++; | |
| 86 } | |
| 87 | |
| 88 assert(lock_owner == GetCurrentThreadId(), "Lock acquired illegally."); | |
| 89 } | |
| 90 | |
| 91 ThreadCritical::~ThreadCritical() { | |
| 92 assert(lock_owner == GetCurrentThreadId(), "unlock attempt by wrong thread"); | |
| 93 assert(lock_count >= 0, "Attempt to unlock when already unlocked"); | |
| 94 | |
| 95 if (lock_count == 0) { | |
| 96 // We're going to unlock | |
| 97 lock_owner = -1; | |
| 98 lock_count = -1; | |
| 99 // No lost wakeups, lock_event stays signaled until reset. | |
| 100 DWORD ret = SetEvent(lock_event); | |
| 101 assert(ret != 0, "unexpected return value from SetEvent"); | |
| 102 } else { | |
| 103 // Just unwinding a recursive lock; | |
| 104 lock_count--; | |
| 105 } | |
| 106 } |