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authorJohannes Sixt <johannes.sixt@telecom.at>2007-11-13 10:14:45 +0100
committerJohannes Sixt <johannes.sixt@telecom.at>2008-06-23 13:40:30 +0200
commit6072fc314e87d53bec7266df5b6c3db2c2c82829 (patch)
tree9fc2067e37ca090764d838dcccde73951ad63a05 /compat
parent82f8d969f581c4bd4a782565709466046d962d81 (diff)
downloadgit-6072fc314e87d53bec7266df5b6c3db2c2c82829.tar.gz
git-6072fc314e87d53bec7266df5b6c3db2c2c82829.tar.xz
Windows: Implement setitimer() and sigaction().
The timer is implemented using a thread that calls the signal handler at regular intervals. We also replace Windows's signal() function because we must intercept that SIGALRM is set (which is used when a timer is canceled). Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Diffstat (limited to 'compat')
-rw-r--r--compat/mingw.c112
-rw-r--r--compat/mingw.h3
2 files changed, 113 insertions, 2 deletions
diff --git a/compat/mingw.c b/compat/mingw.c
index 57af486b7..3ffff75ba 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -125,12 +125,120 @@ struct passwd *getpwuid(int uid)
return &p;
}
+static HANDLE timer_event;
+static HANDLE timer_thread;
+static int timer_interval;
+static int one_shot;
+static sig_handler_t timer_fn = SIG_DFL;
+
+/* The timer works like this:
+ * The thread, ticktack(), is a trivial routine that most of the time
+ * only waits to receive the signal to terminate. The main thread tells
+ * the thread to terminate by setting the timer_event to the signalled
+ * state.
+ * But ticktack() interrupts the wait state after the timer's interval
+ * length to call the signal handler.
+ */
+
+static __stdcall unsigned ticktack(void *dummy)
+{
+ while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
+ if (timer_fn == SIG_DFL)
+ die("Alarm");
+ if (timer_fn != SIG_IGN)
+ timer_fn(SIGALRM);
+ if (one_shot)
+ break;
+ }
+ return 0;
+}
+
+static int start_timer_thread(void)
+{
+ timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
+ if (timer_event) {
+ timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
+ if (!timer_thread )
+ return errno = ENOMEM,
+ error("cannot start timer thread");
+ } else
+ return errno = ENOMEM,
+ error("cannot allocate resources for timer");
+ return 0;
+}
+
+static void stop_timer_thread(void)
+{
+ if (timer_event)
+ SetEvent(timer_event); /* tell thread to terminate */
+ if (timer_thread) {
+ int rc = WaitForSingleObject(timer_thread, 1000);
+ if (rc == WAIT_TIMEOUT)
+ error("timer thread did not terminate timely");
+ else if (rc != WAIT_OBJECT_0)
+ error("waiting for timer thread failed: %lu",
+ GetLastError());
+ CloseHandle(timer_thread);
+ }
+ if (timer_event)
+ CloseHandle(timer_event);
+ timer_event = NULL;
+ timer_thread = NULL;
+}
+
+static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
+{
+ return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
+}
+
int setitimer(int type, struct itimerval *in, struct itimerval *out)
{
- return -1;
+ static const struct timeval zero;
+ static int atexit_done;
+
+ if (out != NULL)
+ return errno = EINVAL,
+ error("setitimer param 3 != NULL not implemented");
+ if (!is_timeval_eq(&in->it_interval, &zero) &&
+ !is_timeval_eq(&in->it_interval, &in->it_value))
+ return errno = EINVAL,
+ error("setitimer: it_interval must be zero or eq it_value");
+
+ if (timer_thread)
+ stop_timer_thread();
+
+ if (is_timeval_eq(&in->it_value, &zero) &&
+ is_timeval_eq(&in->it_interval, &zero))
+ return 0;
+
+ timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
+ one_shot = is_timeval_eq(&in->it_interval, &zero);
+ if (!atexit_done) {
+ atexit(stop_timer_thread);
+ atexit_done = 1;
+ }
+ return start_timer_thread();
}
int sigaction(int sig, struct sigaction *in, struct sigaction *out)
{
- return -1;
+ if (sig != SIGALRM)
+ return errno = EINVAL,
+ error("sigaction only implemented for SIGALRM");
+ if (out != NULL)
+ return errno = EINVAL,
+ error("sigaction: param 3 != NULL not implemented");
+
+ timer_fn = in->sa_handler;
+ return 0;
+}
+
+#undef signal
+sig_handler_t mingw_signal(int sig, sig_handler_t handler)
+{
+ if (sig != SIGALRM)
+ return signal(sig, handler);
+ sig_handler_t old = timer_fn;
+ timer_fn = handler;
+ return old;
}
diff --git a/compat/mingw.h b/compat/mingw.h
index fad855ef9..a369ade9e 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -154,6 +154,9 @@ char *mingw_getcwd(char *pointer, int len);
int mingw_rename(const char*, const char*);
#define rename mingw_rename
+sig_handler_t mingw_signal(int sig, sig_handler_t handler);
+#define signal mingw_signal
+
/*
* git specific compatibility
*/