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comparison src/share/vm/runtime/os.cpp @ 477:24fda36852ce

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6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE Summary: Make reguard_stack change access to RW, not execute and use os::protect_memory with the new parameter when change needed to X. Reviewed-by: acorn, jcoomes
author coleenp
date Wed, 10 Dec 2008 15:14:29 -0800
parents d95b224e9f17
children 773234c55e8c
comparison
equal deleted inserted replaced
473:3ad2b8576c4a 477:24fda36852ce
930 // scheduler starvation problem etc. To avoid the long synchronization 930 // scheduler starvation problem etc. To avoid the long synchronization
931 // time and expensive page trap spinning, 'SerializePageLock' is used to block 931 // time and expensive page trap spinning, 'SerializePageLock' is used to block
932 // the mutator thread if such case is encountered. See bug 6546278 for details. 932 // the mutator thread if such case is encountered. See bug 6546278 for details.
933 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); 933 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states");
934 os::protect_memory((char *)os::get_memory_serialize_page(), 934 os::protect_memory((char *)os::get_memory_serialize_page(),
935 os::vm_page_size(), MEM_PROT_READ, /*is_committed*/true ); 935 os::vm_page_size(), MEM_PROT_READ);
936 os::unguard_memory((char *)os::get_memory_serialize_page(), os::vm_page_size()); 936 os::protect_memory((char *)os::get_memory_serialize_page(),
937 os::vm_page_size(), MEM_PROT_RW);
937 Thread::muxRelease(&SerializePageLock); 938 Thread::muxRelease(&SerializePageLock);
938 } 939 }
939 940
940 // Returns true if the current stack pointer is above the stack shadow 941 // Returns true if the current stack pointer is above the stack shadow
941 // pages, false otherwise. 942 // pages, false otherwise.