Mercurial > hg > truffle
annotate src/share/vm/runtime/threadCritical.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
author | johnc |
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date | Wed, 18 Aug 2010 10:59:06 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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parents:
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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 // ThreadCritical is used to protect short non-blocking critical sections. | |
26 // This class must use no vm facilities that require initialization. | |
27 // It is used very early in the vm's initialization, in allocation | |
28 // code and other areas. ThreadCritical regions are reentrant. | |
29 // | |
30 // Due to race conditions during vm exit, some of the os level | |
31 // synchronization primitives may not be deallocated at exit. It | |
605 | 32 // is a good plan to implement the platform dependent sections of |
0 | 33 // code with resources that are recoverable during process |
34 // cleanup by the os. Calling the initialize method before use | |
35 // is also problematic, it is best to use preinitialized primitives | |
36 // if possible. As an example: | |
37 // | |
38 // mutex_t mp = DEFAULTMUTEX; | |
39 // | |
40 // Also note that this class is declared as a StackObj to enforce | |
41 // block structured short locks. It cannot be declared a ResourceObj | |
42 // or CHeapObj, due to initialization issues. | |
43 | |
44 class ThreadCritical : public StackObj { | |
45 friend class os; | |
46 private: | |
47 static void initialize(); | |
48 static void release(); | |
49 | |
50 public: | |
51 ThreadCritical(); | |
52 ~ThreadCritical(); | |
53 }; |