X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Ftimeval.c;h=5e423875852c450dbe212fee47b885b1593ff702;hb=36775dad3505929f8370166c33e8e0f04ca96c1c;hp=314b3f4303653ee3f51ed757f5f24c6d406b53c3;hpb=03fbffbda4d36188944a4df39eace449a0c306dd;p=openvswitch

diff --git a/lib/timeval.c b/lib/timeval.c
index 314b3f43..5e423875 100644
--- a/lib/timeval.c
+++ b/lib/timeval.c
@@ -43,7 +43,8 @@ static struct timeval now;
 /* Time at which to die with SIGALRM (if not TIME_MIN). */
 static time_t deadline = TIME_MIN;
 
-static void setup_timer(void);
+static void set_up_timer(void);
+static void set_up_signal(int flags);
 static void sigalrm_handler(int);
 static void refresh_if_ticked(void);
 static time_t time_add(time_t, time_t);
@@ -51,13 +52,11 @@ static void block_sigalrm(sigset_t *);
 static void unblock_sigalrm(const sigset_t *);
 static void log_poll_interval(long long int last_wakeup,
                               const struct rusage *last_rusage);
-static long long int timeval_to_msec(const struct timeval *);
 
 /* Initializes the timetracking module. */
 void
 time_init(void)
 {
-    struct sigaction sa;
     if (inited) {
         return;
     }
@@ -68,21 +67,53 @@ time_init(void)
     gettimeofday(&now, NULL);
     tick = false;
 
-    /* Set up signal handler. */
+    set_up_signal(SA_RESTART);
+    set_up_timer();
+}
+
+static void
+set_up_signal(int flags)
+{
+    struct sigaction sa;
+
     memset(&sa, 0, sizeof sa);
     sa.sa_handler = sigalrm_handler;
     sigemptyset(&sa.sa_mask);
-    sa.sa_flags = SA_RESTART;
+    sa.sa_flags = flags;
     if (sigaction(SIGALRM, &sa, NULL)) {
         ovs_fatal(errno, "sigaction(SIGALRM) failed");
     }
+}
 
-    /* Set up periodic signal. */
-    setup_timer();
+/* Remove SA_RESTART from the flags for SIGALRM, so that any system call that
+ * is interrupted by the periodic timer interrupt will return EINTR instead of
+ * continuing after the signal handler returns.
+ *
+ * time_disable_restart() and time_enable_restart() may be usefully wrapped
+ * around function calls that might otherwise block forever unless interrupted
+ * by a signal, e.g.:
+ *
+ *   time_disable_restart();
+ *   fcntl(fd, F_SETLKW, &lock);
+ *   time_enable_restart();
+ */
+void
+time_disable_restart(void)
+{
+    set_up_signal(0);
+}
+
+/* Add SA_RESTART to the flags for SIGALRM, so that any system call that
+ * is interrupted by the periodic timer interrupt will continue after the
+ * signal handler returns instead of returning EINTR. */
+void
+time_enable_restart(void)
+{
+    set_up_signal(SA_RESTART);
 }
 
 static void
-setup_timer(void)
+set_up_timer(void)
 {
     struct itimerval itimer;
 
@@ -102,7 +133,7 @@ setup_timer(void)
 void
 time_postfork(void)
 {
-    setup_timer();
+    set_up_timer();
 }
 
 /* Forces a refresh of the current time from the kernel.  It is not usually
@@ -255,7 +286,7 @@ unblock_sigalrm(const sigset_t *oldsigs)
     }
 }
 
-static long long int
+long long int
 timeval_to_msec(const struct timeval *tv)
 {
     return (long long int) tv->tv_sec * 1000 + tv->tv_usec / 1000;