Mercurial > hg > truffle
comparison src/os/posix/vm/os_posix.cpp @ 11198:1e6d5dec4a4e
Merge.
| author | Christian Humer <christian.humer@gmail.com> |
|---|---|
| date | Mon, 05 Aug 2013 13:20:06 +0200 |
| parents | 5e3b6f79d280 |
| children | f92b82d454fa cc56f122f3f7 f42f2e2a1518 |
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| 11197:3479ab380552 | 11198:1e6d5dec4a4e |
|---|---|
| 257 } | 257 } |
| 258 | 258 |
| 259 FILE* os::open(int fd, const char* mode) { | 259 FILE* os::open(int fd, const char* mode) { |
| 260 return ::fdopen(fd, mode); | 260 return ::fdopen(fd, mode); |
| 261 } | 261 } |
| 262 | |
| 263 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { | |
| 264 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); | |
| 265 } | |
| 266 | |
| 267 /* | |
| 268 * See the caveats for this class in os_posix.hpp | |
| 269 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this | |
| 270 * method and returns false. If none of the signals are raised, returns true. | |
| 271 * The callback is supposed to provide the method that should be protected. | |
| 272 */ | |
| 273 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { | |
| 274 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); | |
| 275 assert(!WatcherThread::watcher_thread()->has_crash_protection(), | |
| 276 "crash_protection already set?"); | |
| 277 | |
| 278 if (sigsetjmp(_jmpbuf, 1) == 0) { | |
| 279 // make sure we can see in the signal handler that we have crash protection | |
| 280 // installed | |
| 281 WatcherThread::watcher_thread()->set_crash_protection(this); | |
| 282 cb.call(); | |
| 283 // and clear the crash protection | |
| 284 WatcherThread::watcher_thread()->set_crash_protection(NULL); | |
| 285 return true; | |
| 286 } | |
| 287 // this happens when we siglongjmp() back | |
| 288 WatcherThread::watcher_thread()->set_crash_protection(NULL); | |
| 289 return false; | |
| 290 } | |
| 291 | |
| 292 void os::WatcherThreadCrashProtection::restore() { | |
| 293 assert(WatcherThread::watcher_thread()->has_crash_protection(), | |
| 294 "must have crash protection"); | |
| 295 | |
| 296 siglongjmp(_jmpbuf, 1); | |
| 297 } | |
| 298 | |
| 299 void os::WatcherThreadCrashProtection::check_crash_protection(int sig, | |
| 300 Thread* thread) { | |
| 301 | |
| 302 if (thread != NULL && | |
| 303 thread->is_Watcher_thread() && | |
| 304 WatcherThread::watcher_thread()->has_crash_protection()) { | |
| 305 | |
| 306 if (sig == SIGSEGV || sig == SIGBUS) { | |
| 307 WatcherThread::watcher_thread()->crash_protection()->restore(); | |
| 308 } | |
| 309 } | |
| 310 } |