X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=rts%2Fposix%2FSignals.c;fp=rts%2Fposix%2FSignals.c;h=3b93fccbb70f13512b133d6d9d47dcbcdc139fc2;hp=660065734b84ff07dbc8442edb9603092f1897fe;hb=2d5e052d795c99c17b1ca6fa1ca8be7d082be09c;hpb=cd0e2c0cc3005c3f5e74eeda57dc9cebbe1bac7e

diff --git a/rts/posix/Signals.c b/rts/posix/Signals.c
index 6600657..3b93fcc 100644
--- a/rts/posix/Signals.c
+++ b/rts/posix/Signals.c
@@ -86,18 +86,16 @@ static int io_manager_pipe = -1;
 
 #define IO_MANAGER_WAKEUP 0xff
 #define IO_MANAGER_DIE    0xfe
+#define IO_MANAGER_SYNC   0xfd
 
 void
 setIOManagerPipe (int fd)
 {
     // only called when THREADED_RTS, but unconditionally
     // compiled here because GHC.Conc depends on it.
-    if (io_manager_pipe < 0) {
-        io_manager_pipe = fd;
-    }
+    io_manager_pipe = fd;
 }
 
-#if defined(THREADED_RTS)
 void
 ioManagerWakeup (void)
 {
@@ -111,6 +109,19 @@ ioManagerWakeup (void)
 }
 
 void
+ioManagerSync (void)
+{
+    int r;
+    // Wake up the IO Manager thread by sending a byte down its pipe
+    if (io_manager_pipe >= 0) {
+	StgWord8 byte = (StgWord8)IO_MANAGER_SYNC;
+	r = write(io_manager_pipe, &byte, 1);
+        if (r == -1) { sysErrorBelch("ioManagerSync: write"); }
+    }
+}
+
+#if defined(THREADED_RTS)
+void
 ioManagerDie (void)
 {
     int r;