1 /*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // The direct lock/unlock calls do not force a collection if an unlock
26 // decrements the count to zero. Avoid calling these if at all possible.
27
28 class GC_locker: public AllStatic {
29 private:
30 static volatile jint _jni_lock_count; // number of jni active instances
31 static volatile jint _lock_count; // number of other active instances
32 static volatile bool _needs_gc; // heap is filling, we need a GC
33 // note: bool is typedef'd as jint
34 static volatile bool _doing_gc; // unlock_critical() is doing a GC
35
36 // Accessors
37 static bool is_jni_active() {
38 return _jni_lock_count > 0;
39 }
40
41 static void set_needs_gc() {
42 assert(SafepointSynchronize::is_at_safepoint(),
43 "needs_gc is only set at a safepoint");
44 _needs_gc = true;
293
294 class No_Alloc_Verifier : public StackObj {
295 private:
296 bool _activated;
297
298 public:
299 #ifdef ASSERT
300 No_Alloc_Verifier(bool activated = true) {
301 _activated = activated;
302 if (_activated) Thread::current()->_allow_allocation_count++;
303 }
304
305 ~No_Alloc_Verifier() {
306 if (_activated) Thread::current()->_allow_allocation_count--;
307 }
308 #else
309 No_Alloc_Verifier(bool activated = true) {}
310 ~No_Alloc_Verifier() {}
311 #endif
312 };
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1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_MEMORY_GCLOCKER_HPP
26 #define SHARE_VM_MEMORY_GCLOCKER_HPP
27
28 #include "gc_interface/collectedHeap.hpp"
29 #include "memory/genCollectedHeap.hpp"
30 #include "memory/universe.hpp"
31 #include "oops/oop.hpp"
32 #ifdef TARGET_OS_FAMILY_linux
33 # include "os_linux.inline.hpp"
34 # include "thread_linux.inline.hpp"
35 #endif
36 #ifdef TARGET_OS_FAMILY_solaris
37 # include "os_solaris.inline.hpp"
38 # include "thread_solaris.inline.hpp"
39 #endif
40 #ifdef TARGET_OS_FAMILY_windows
41 # include "os_windows.inline.hpp"
42 # include "thread_windows.inline.hpp"
43 #endif
44
45 // The direct lock/unlock calls do not force a collection if an unlock
46 // decrements the count to zero. Avoid calling these if at all possible.
47
48 class GC_locker: public AllStatic {
49 private:
50 static volatile jint _jni_lock_count; // number of jni active instances
51 static volatile jint _lock_count; // number of other active instances
52 static volatile bool _needs_gc; // heap is filling, we need a GC
53 // note: bool is typedef'd as jint
54 static volatile bool _doing_gc; // unlock_critical() is doing a GC
55
56 // Accessors
57 static bool is_jni_active() {
58 return _jni_lock_count > 0;
59 }
60
61 static void set_needs_gc() {
62 assert(SafepointSynchronize::is_at_safepoint(),
63 "needs_gc is only set at a safepoint");
64 _needs_gc = true;
313
314 class No_Alloc_Verifier : public StackObj {
315 private:
316 bool _activated;
317
318 public:
319 #ifdef ASSERT
320 No_Alloc_Verifier(bool activated = true) {
321 _activated = activated;
322 if (_activated) Thread::current()->_allow_allocation_count++;
323 }
324
325 ~No_Alloc_Verifier() {
326 if (_activated) Thread::current()->_allow_allocation_count--;
327 }
328 #else
329 No_Alloc_Verifier(bool activated = true) {}
330 ~No_Alloc_Verifier() {}
331 #endif
332 };
333
334 #endif // SHARE_VM_MEMORY_GCLOCKER_HPP
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