sched: Allow more than one running scheduler instance.

[paraslash.git] / signal.c

diff --git a/signal.c b/signal.c
index f02c453a04a02e5d3e1c8a9c791aba8275a60671..aa63c8b5461a9627c021a514b83b7c8ee1067067 100644 (file)
--- a/signal.c
+++ b/signal.c
@@ -147,10 +147,50 @@ void para_install_sighandler(int sig)
        para_sigaction(sig, &generic_signal_handler);
 }
 
+/**
+ * Block a signal for the caller.
+ *
+ * \param sig The signal to block.
+ *
+ * This sets the given signal in the current signal mask of the calling process
+ * to prevent this signal from delivery.
+ *
+ * \sa \ref para_unblock_signal(), sigprocmask(2), sigaddset(3).
+ */
+void para_block_signal(int sig)
+{
+       sigset_t set;
+
+       PARA_DEBUG_LOG("blocking signal %d\n", sig);
+       sigemptyset(&set);
+       sigaddset(&set, sig);
+       sigprocmask(SIG_BLOCK, &set, NULL);
+}
+
+/**
+ * Unblock a signal.
+ *
+ * \param sig The signal to unblock.
+ *
+ * This function removes the given signal from the current set of blocked
+ * signals.
+ *
+ * \sa \ref para_block_signal(), sigprocmask(2), sigaddset(3).
+ */
+void para_unblock_signal(int sig)
+{
+       sigset_t set;
+
+       PARA_DEBUG_LOG("unblocking signal %d\n", sig);
+       sigemptyset(&set);
+       sigaddset(&set, sig);
+       sigprocmask(SIG_UNBLOCK, &set, NULL);
+}
+
 /**
  * Return the number of the next pending signal.
  *
- * \param rfds Th fd_set containing the signal pipe.
+ * \param rfds The fd_set containing the signal pipe.
  *
  * \return On success, the number of the received signal is returned. If there
  * is no signal currently pending, the function returns zero. On read errors