Add runtime profiling infrastructure, not yet working.

From-SVN: r171579

1 files changed, 78 insertions, 28 deletions

diff --git a/libgo/runtime/go-signal.c b/libgo/runtime/go-signal.c
index 8898f84..edeeccc 100644
--- a/libgo/runtime/go-signal.c
+++ b/libgo/runtime/go-signal.c
@@ -6,6 +6,7 @@
 
 #include <signal.h>
 #include <stdlib.h>
+#include <sys/time.h>
 
 #include "go-assert.h"
 #include "go-panic.h"
@@ -13,10 +14,8 @@
 
 #include "runtime.h"
 
-#undef int 
-
-#ifndef SA_ONSTACK
-#define SA_ONSTACK 0
+#ifndef SA_RESTART
+  #define SA_RESTART 0
 #endif
 
 /* What to do for a signal.  */
@@ -27,68 +26,70 @@ struct sigtab
   int sig;
   /* Nonzero if the signal should be ignored.  */
   _Bool ignore;
+  /* Nonzero if we should restart system calls.  */
+  _Bool restart;
 };
 
 /* What to do for signals.  */
 
 static struct sigtab signals[] =
 {
-  { SIGHUP, 0 },
-  { SIGINT, 0 },
-  { SIGALRM, 1 },
-  { SIGTERM, 0 },
+  { SIGHUP, 0, 1 },
+  { SIGINT, 0, 1 },
+  { SIGALRM, 1, 1 },
+  { SIGTERM, 0, 1 },
 #ifdef SIGBUS
-  { SIGBUS, 0 },
+  { SIGBUS, 0, 0 },
 #endif
 #ifdef SIGFPE
-  { SIGFPE, 0 },
+  { SIGFPE, 0, 0 },
 #endif
 #ifdef SIGUSR1
-  { SIGUSR1, 1 },
+  { SIGUSR1, 1, 1 },
 #endif
 #ifdef SIGSEGV
-  { SIGSEGV, 0 },
+  { SIGSEGV, 0, 0 },
 #endif
 #ifdef SIGUSR2
-  { SIGUSR2, 1 },
+  { SIGUSR2, 1, 1 },
 #endif
 #ifdef SIGPIPE
-  { SIGPIPE, 1 },
+  { SIGPIPE, 1, 0 },
 #endif
 #ifdef SIGCHLD
-  { SIGCHLD, 1 },
+  { SIGCHLD, 1, 1 },
 #endif
 #ifdef SIGTSTP
-  { SIGTSTP, 1 },
+  { SIGTSTP, 1, 1 },
 #endif
 #ifdef SIGTTIN
-  { SIGTTIN, 1 },
+  { SIGTTIN, 1, 1 },
 #endif
 #ifdef SIGTTOU
-  { SIGTTOU, 1 },
+  { SIGTTOU, 1, 1 },
 #endif
 #ifdef SIGURG
-  { SIGURG, 1 },
+  { SIGURG, 1, 1 },
 #endif
 #ifdef SIGXCPU
-  { SIGXCPU, 1 },
+  { SIGXCPU, 1, 1 },
 #endif
 #ifdef SIGXFSZ
-  { SIGXFSZ, 1 },
+  { SIGXFSZ, 1, 1 },
 #endif
 #ifdef SIGVTARLM
-  { SIGVTALRM, 1 },
+  { SIGVTALRM, 1, 1 },
 #endif
 #ifdef SIGWINCH
-  { SIGWINCH, 1 },
+  { SIGWINCH, 1, 1 },
 #endif
 #ifdef SIGIO
-  { SIGIO, 1 },
+  { SIGIO, 1, 1 },
 #endif
 #ifdef SIGPWR
-  { SIGPWR, 1 },
+  { SIGPWR, 1, 1 },
 #endif
-  { -1, 0 }
+  { -1, 0, 0 }
 };
 
 /* The Go signal handler.  */
@@ -99,6 +100,13 @@ sighandler (int sig)
   const char *msg;
   int i;
 
+  if (sig == SIGPROF)
+    {
+      /* FIXME.  */
+      runtime_sigprof (0, 0, nil);
+      return;
+    }
+
   /* FIXME: Should check siginfo for more information when
      available.  */
   msg = NULL;
@@ -192,6 +200,48 @@ __initsig ()
   __go_assert (i == 0);
 
   for (i = 0; signals[i].sig != -1; ++i)
-    if (sigaction (signals[i].sig, &sa, NULL) != 0)
-      __go_assert (0);
+    {
+      sa.sa_flags = signals[i].restart ? SA_RESTART : 0;
+      if (sigaction (signals[i].sig, &sa, NULL) != 0)
+	__go_assert (0);
+    }
+}
+
+void
+runtime_resetcpuprofiler(int32 hz)
+{
+  struct itimerval it;
+  struct sigaction sa;
+  int i;
+
+  memset (&it, 0, sizeof it);
+
+  memset (&sa, 0, sizeof sa);
+  i = sigfillset (&sa.sa_mask);
+  __go_assert (i == 0);
+
+  if (hz == 0)
+    {
+      i = setitimer (ITIMER_PROF, &it, NULL);
+      __go_assert (i == 0);
+
+      sa.sa_handler = SIG_IGN;
+      i = sigaction (SIGPROF, &sa, NULL);
+      __go_assert (i == 0);
+    }
+  else
+    {
+      sa.sa_handler = sighandler;
+      sa.sa_flags = SA_RESTART;
+      i = sigaction (SIGPROF, &sa, NULL);
+      __go_assert (i == 0);
+
+      it.it_interval.tv_sec = 0;
+      it.it_interval.tv_usec = 1000000 / hz;
+      it.it_value = it.it_interval;
+      i = setitimer (ITIMER_PROF, &it, NULL);
+      __go_assert (i == 0);
+    }
+
+  m->profilehz = hz;
 }