Thread suspension: Implement for Linux

src/trusted/service_runtime/posix/nacl_signal.c

Index: src/trusted/service_runtime/posix/nacl_signal.c
diff --git a/src/trusted/service_runtime/posix/nacl_signal.c b/src/trusted/service_runtime/posix/nacl_signal.c
index d266c539f950162d43af0ef0abac0953fd58fcb4..214a3d08f35245de36ffed28e605c29c8d95d35c 100644
--- a/src/trusted/service_runtime/posix/nacl_signal.c
+++ b/src/trusted/service_runtime/posix/nacl_signal.c
@@ -46,6 +46,7 @@
 static int s_Signals[] = {
 #if NACL_LINUX
   SIGSTKFLT,
+  NACL_THREAD_SUSPEND_SIGNAL,
 #endif
   SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGBUS, SIGFPE, SIGSEGV
 };
@@ -316,6 +317,13 @@ static void SignalCatch(int sig, siginfo_t *info, void *uc) {
   }
 #endif
 
+#if NACL_LINUX
+  if (sig == NACL_THREAD_SUSPEND_SIGNAL) {
+    NaClSuspendSignalHandler();
+    return;
+  }
+#endif
+
   if (is_untrusted && sig == SIGSEGV) {
     if (DispatchToUntrustedHandler(natp, &sigCtx)) {
       NaClSignalContextToHandler(uc, &sigCtx);