libgo/runtime/signal_unix.c

   1 // Copyright 2012 The Go Authors.  All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // +build darwin freebsd linux openbsd netbsd
   6
   7 #include <sys/time.h>
   8
   9 #include "runtime.h"
  10 #include "defs.h"
  11
  12 extern SigTab runtime_sigtab[];
  13
  14 void
  15 runtime_initsig(void)
  16 {
  17         int32 i;
  18         SigTab *t;
  19
  20         // First call: basic setup.
  21         for(i = 0; runtime_sigtab[i].sig != -1; i++) {
  22                 t = &runtime_sigtab[i];
  23                 if((t->flags == 0) || (t->flags & SigDefault))
  24                         continue;
  25                 runtime_setsig(i, false, true);
  26         }
  27 }
  28
  29 void
  30 runtime_sigenable(uint32 sig)
  31 {
  32         int32 i;
  33         SigTab *t;
  34
  35         for(i = 0; runtime_sigtab[i].sig != -1; i++) {
  36                 // ~0 means all signals.
  37                 if(~sig == 0 || runtime_sigtab[i].sig == (int32)sig) {
  38                         t = &runtime_sigtab[i];
  39                         if(t->flags & SigDefault) {
  40                                 runtime_setsig(i, false, true);
  41                                 t->flags &= ~SigDefault;  // make this idempotent
  42                         }
  43                 }
  44         }
  45 }
  46
  47 void
  48 runtime_resetcpuprofiler(int32 hz)
  49 {
  50         struct itimerval it;
  51
  52         runtime_memclr((byte*)&it, sizeof it);
  53         if(hz == 0) {
  54                 runtime_setitimer(ITIMER_PROF, &it, nil);
  55                 runtime_setprof(false);
  56         } else {
  57                 it.it_interval.tv_sec = 0;
  58                 it.it_interval.tv_usec = 1000000 / hz;
  59                 it.it_value = it.it_interval;
  60                 runtime_setitimer(ITIMER_PROF, &it, nil);
  61                 runtime_setprof(true);
  62         }
  63         runtime_m()->profilehz = hz;
  64 }