[project @ 2005-01-28 12:55:17 by simonmar]

[ghc-hetmet.git] / ghc / rts / Signals.c

diff --git a/ghc/rts/Signals.c b/ghc/rts/Signals.c
index 9c767d4..67fbf42 100644 (file)
--- a/ghc/rts/Signals.c
+++ b/ghc/rts/Signals.c
@@ -1,5 +1,4 @@
 /* -----------------------------------------------------------------------------
- * $Id: Signals.c,v 1.36 2003/03/29 00:00:41 sof Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -16,10 +15,13 @@
 #include "Signals.h"
 #include "RtsUtils.h"
 #include "RtsFlags.h"
-#include "StablePriv.h"
 
-#ifdef alpha_TARGET_ARCH
-# include <machine/fpu.h>
+#ifdef alpha_HOST_ARCH
+# if defined(linux_HOST_OS)
+#  include <asm/fpu.h>
+# else
+#  include <machine/fpu.h>
+# endif
 #endif
 
 #ifdef HAVE_UNISTD_H
@@ -32,7 +34,14 @@
 
 #include <stdlib.h>
 
-#ifndef PAR
+/* This curious flag is provided for the benefit of the Haskell binding
+ * to POSIX.1 to control whether or not to include SA_NOCLDSTOP when
+ * installing a SIGCHLD handler. 
+ * 
+ */
+StgInt nocldstop = 0;
+
+#if defined(RTS_USER_SIGNALS)
 
 /* SUP: The type of handlers is a little bit, well, doubtful... */
 static StgInt *handlers = NULL; /* Dynamically grown array of signal handlers */
@@ -45,25 +54,25 @@ static nat n_haskell_handlers = 0;
 StgPtr pending_handler_buf[N_PENDING_HANDLERS];
 StgPtr *next_pending_handler = pending_handler_buf;
 
-StgInt nocldstop = 0;
-
+/* -----------------------------------------------------------------------------
+ * Signal handling
+ * -------------------------------------------------------------------------- */
 
 #ifdef RTS_SUPPORTS_THREADS
 pthread_t signalHandlingThread;
 #endif
 
-       // Handle all signals in the current thread.
-       // Called from Capability.c whenever the main capability is granted to a thread
-       // and in installDefaultHandlers
+// Handle all signals in the current thread.
+// Called from Capability.c whenever the main capability is granted to a thread
+// and in installDefaultHandlers
 void
-handleSignalsInThisThread()
+handleSignalsInThisThread(void)
 {
 #ifdef RTS_SUPPORTS_THREADS
     signalHandlingThread = pthread_self();
 #endif
 }
 
-
 /* -----------------------------------------------------------------------------
  * Allocate/resize the table of signal handlers.
  * -------------------------------------------------------------------------- */
@@ -161,7 +170,7 @@ generic_handler(int sig)
 
     // stack full?
     if (next_pending_handler == &pending_handler_buf[N_PENDING_HANDLERS]) {
-       prog_belch("too many pending signals");
+       errorBelch("too many pending signals");
        stg_exit(EXIT_FAILURE);
     }
     
@@ -287,7 +296,7 @@ stg_sig_install(int sig, int spi, StgStablePtr *handler, void *mask)
        }
        return STG_SIG_ERR;
     }
-    
+
     if (previous_spi == STG_SIG_DFL || previous_spi == STG_SIG_IGN
        || previous_spi == STG_SIG_ERR) {
        return previous_spi;
@@ -338,20 +347,20 @@ markSignalHandlers (evac_fn evac)
     }
 }
 
-#else // PAR
+#else /* !RTS_USER_SIGNALS */
 StgInt 
-stg_sig_install(StgInt sig, StgInt spi, StgStablePtr handler, sigset_t *mask)
+stg_sig_install(StgInt sig STG_UNUSED,
+               StgInt spi STG_UNUSED,
+               StgStablePtr* handler STG_UNUSED,
+               void* mask STG_UNUSED)
 {
-    // don't fflush(stdout); WORKAROUND bug in Linux glibc
-    barf("no signal handling support in a parallel implementation");
+  //barf("User signals not supported");
+  return STG_SIG_DFL;
 }
 
-void
-startSignalHandlers(void)
-{
-}
 #endif
 
+#if defined(RTS_USER_SIGNALS)
 /* -----------------------------------------------------------------------------
  * SIGINT handler.
  *
@@ -421,7 +430,7 @@ initDefaultHandlers()
     startup_guy = pthread_self();
 #endif
 #ifdef RTS_SUPPORTS_THREADS
-       handleSignalsInThisThread();
+    handleSignalsInThisThread();
 #endif
 
     // install the SIGINT handler
@@ -429,10 +438,10 @@ initDefaultHandlers()
     sigemptyset(&action.sa_mask);
     action.sa_flags = 0;
     if (sigaction(SIGINT, &action, &oact) != 0) {
-       prog_belch("warning: failed to install SIGINT handler");
+       errorBelch("warning: failed to install SIGINT handler");
     }
 
-#ifndef cygwin32_TARGET_OS
+#if defined(HAVE_SIGINTERRUPT)
     siginterrupt(SIGINT, 1);   // isn't this the default? --SDM
 #endif
 
@@ -441,7 +450,7 @@ initDefaultHandlers()
     sigemptyset(&action.sa_mask);
     action.sa_flags = 0;
     if (sigaction(SIGCONT, &action, &oact) != 0) {
-       prog_belch("warning: failed to install SIGCONT handler");
+       errorBelch("warning: failed to install SIGCONT handler");
     }
 
     // install the SIGFPE handler
@@ -459,11 +468,13 @@ initDefaultHandlers()
     sigemptyset(&action.sa_mask);
     action.sa_flags = 0;
     if (sigaction(SIGFPE, &action, &oact) != 0) {
-       prog_belch("warning: failed to install SIGFPE handler");
+       errorBelch("warning: failed to install SIGFPE handler");
     }
 #endif
 
-#ifdef alpha_TARGET_ARCH
+#ifdef alpha_HOST_ARCH
     ieee_set_fp_control(0);
 #endif
 }
+
+#endif /* RTS_USER_SIGNALS */