2117 }
2118
2119 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2120
2121 clear_external_suspend();
2122
2123 if (is_ext_suspended()) {
2124 clear_ext_suspended();
2125 SR_lock()->notify_all();
2126 }
2127 }
2128
2129 void JavaThread::create_stack_guard_pages() {
2130 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return;
2131 address low_addr = stack_base() - stack_size();
2132 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
2133
2134 int allocate = os::allocate_stack_guard_pages();
2135 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
2136
2137 if (allocate && !os::commit_memory((char *) low_addr, len)) {
2138 warning("Attempt to allocate stack guard pages failed.");
2139 return;
2140 }
2141
2142 if (os::guard_memory((char *) low_addr, len)) {
2143 _stack_guard_state = stack_guard_enabled;
2144 } else {
2145 warning("Attempt to protect stack guard pages failed.");
2146 if (os::uncommit_memory((char *) low_addr, len)) {
2147 warning("Attempt to deallocate stack guard pages failed.");
2148 }
2149 }
2150 }
2151
2152 void JavaThread::remove_stack_guard_pages() {
2153 if (_stack_guard_state == stack_guard_unused) return;
2154 address low_addr = stack_base() - stack_size();
2155 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
2156
2157 if (os::allocate_stack_guard_pages()) {
2158 if (os::uncommit_memory((char *) low_addr, len)) {
2159 _stack_guard_state = stack_guard_unused;
2160 } else {
2161 warning("Attempt to deallocate stack guard pages failed.");
2162 }
2163 } else {
2164 if (_stack_guard_state == stack_guard_unused) return;
2165 if (os::unguard_memory((char *) low_addr, len)) {
2166 _stack_guard_state = stack_guard_unused;
2167 } else {
2168 warning("Attempt to unprotect stack guard pages failed.");
2169 }
2170 }
2171 }
2172
2173 void JavaThread::enable_stack_yellow_zone() {
2174 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
2175 assert(_stack_guard_state != stack_guard_enabled, "already enabled");
2176
2177 // The base notation is from the stacks point of view, growing downward.
2178 // We need to adjust it to work correctly with guard_memory()
|
2117 }
2118
2119 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2120
2121 clear_external_suspend();
2122
2123 if (is_ext_suspended()) {
2124 clear_ext_suspended();
2125 SR_lock()->notify_all();
2126 }
2127 }
2128
2129 void JavaThread::create_stack_guard_pages() {
2130 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return;
2131 address low_addr = stack_base() - stack_size();
2132 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
2133
2134 int allocate = os::allocate_stack_guard_pages();
2135 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
2136
2137 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) {
2138 warning("Attempt to allocate stack guard pages failed.");
2139 return;
2140 }
2141
2142 if (os::guard_memory((char *) low_addr, len)) {
2143 _stack_guard_state = stack_guard_enabled;
2144 } else {
2145 warning("Attempt to protect stack guard pages failed.");
2146 if (os::uncommit_memory((char *) low_addr, len)) {
2147 warning("Attempt to deallocate stack guard pages failed.");
2148 }
2149 }
2150 }
2151
2152 void JavaThread::remove_stack_guard_pages() {
2153 if (_stack_guard_state == stack_guard_unused) return;
2154 address low_addr = stack_base() - stack_size();
2155 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
2156
2157 if (os::allocate_stack_guard_pages()) {
2158 if (os::remove_stack_guard_pages((char *) low_addr, len)) {
2159 _stack_guard_state = stack_guard_unused;
2160 } else {
2161 warning("Attempt to deallocate stack guard pages failed.");
2162 }
2163 } else {
2164 if (_stack_guard_state == stack_guard_unused) return;
2165 if (os::unguard_memory((char *) low_addr, len)) {
2166 _stack_guard_state = stack_guard_unused;
2167 } else {
2168 warning("Attempt to unprotect stack guard pages failed.");
2169 }
2170 }
2171 }
2172
2173 void JavaThread::enable_stack_yellow_zone() {
2174 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
2175 assert(_stack_guard_state != stack_guard_enabled, "already enabled");
2176
2177 // The base notation is from the stacks point of view, growing downward.
2178 // We need to adjust it to work correctly with guard_memory()
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