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6929067: Stack guard pages should be removed when thread is detached

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Add code to unmap stack guard area when thread is detached.

Reviewed-by: coleenp, kamg
This commit is contained in:
Coleen Phillimore 2010-03-12 10:42:16 -05:00
parent 8d1747bc4b
commit 053d7adeb2
8 changed files with 271 additions and 2 deletions
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3
hotspot/src/share/vm/runtime/os.hpp
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@ -218,6 +218,9 @@ class os: AllStatic {
static bool guard_memory(char* addr, size_t bytes);
static bool unguard_memory(char* addr, size_t bytes);
static bool create_stack_guard_pages(char* addr, size_t bytes);
static bool remove_stack_guard_pages(char* addr, size_t bytes);
static char* map_memory(int fd, const char* file_name, size_t file_offset,
char *addr, size_t bytes, bool read_only = false,
bool allow_exec = false);

4
hotspot/src/share/vm/runtime/thread.cpp
View file

@ -2137,7 +2137,7 @@ void JavaThread::create_stack_guard_pages() {
int allocate = os::allocate_stack_guard_pages();
// warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
if (allocate && !os::commit_memory((char *) low_addr, len)) {
if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) {
warning("Attempt to allocate stack guard pages failed.");
return;
}
@ -2158,7 +2158,7 @@ void JavaThread::remove_stack_guard_pages() {
size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
if (os::allocate_stack_guard_pages()) {
if (os::uncommit_memory((char *) low_addr, len)) {
if (os::remove_stack_guard_pages((char *) low_addr, len)) {
_stack_guard_state = stack_guard_unused;
} else {
warning("Attempt to deallocate stack guard pages failed.");