initial import

from http://www.informit.com/store/programming-with-posix-threads-9780201633924
2013-03-28 10:34:22 +08:00
commit a5ec64177d
55 changed files with 6183 additions and 0 deletions
--- a/sigev_thread.c
+++ b/sigev_thread.c
@@ -0,0 +1,106 @@
+/*
+ * sigev_thread.c
+ *
+ * Demonstrate use of the SIGEV_THREAD signal mode to handle
+ * signals by creating a new thread.
+ *
+ * Special notes: This program will not compile on Solaris 2.5.
+ * It will compile on Digital UNIX 4.0 but will not work.
+ * Digital UNIX 4.0c fixes SIGEV_THREAD, and sources inform me
+ * that Solaris 2.6 will also fix SIGEV_THREAD. To try this on
+ * Solaris 2.5, remove the "#ifdef sun" conditionals in main.
+ */
+#include <pthread.h>
+#include <sys/signal.h>
+#include <sys/time.h>
+#include "errors.h"
+
+timer_t timer_id;
+pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+int counter = 0;
+
+/*
+ * Thread start routine to notify the application when the
+ * timer expires. This routine is run "as if" it were a new
+ * thread, each time the timer expires.
+ *
+ * When the timer has expired 5 times, the main thread will
+ * be awakened, and will terminate the program.
+ */
+void
+timer_thread (void *arg)
+{
+    int status;
+
+    status = pthread_mutex_lock (&mutex);
+    if (status != 0)
+        err_abort (status, "Lock mutex");
+    if (++counter >= 5) {
+        status = pthread_cond_signal (&cond);
+        if (status != 0)
+            err_abort (status, "Signal condition");
+    }
+    status = pthread_mutex_unlock (&mutex);
+    if (status != 0)
+        err_abort (status, "Unlock mutex");
+
+    printf ("Timer %d\n", counter);
+}
+
+main()
+{
+    int status;
+    struct itimerspec ts;
+    struct sigevent se;
+
+#ifdef sun
+    fprintf (
+        stderr,
+        "This program cannot compile on Solaris 2.5.\n"
+        "To build and run on Solaris 2.6, remove the\n"
+        "\"#ifdef sun\" block in main().\n");
+#else
+    /*
+     * Set the sigevent structure to cause the signal to be
+     * delivered by creating a new thread.
+     */
+    se.sigev_notify = SIGEV_THREAD;
+    se.sigev_value.sival_ptr = &timer_id;
+    se.sigev_notify_function = timer_thread;
+    se.sigev_notify_attributes = NULL;
+
+    /*
+     * Specify a repeating timer that fires each 5 seconds.
+     */
+    ts.it_value.tv_sec = 5;
+    ts.it_value.tv_nsec = 0;
+    ts.it_interval.tv_sec = 5;
+    ts.it_interval.tv_nsec = 0;
+
+    DPRINTF (("Creating timer\n"));
+    status = timer_create(CLOCK_REALTIME, &se, &timer_id);
+    if (status == -1)
+        errno_abort ("Create timer");
+
+    DPRINTF ((
+        "Setting timer %d for 5-second expiration...\n", timer_id));
+    status = timer_settime(timer_id, 0, &ts, 0);
+    if (status == -1)
+        errno_abort ("Set timer");
+
+    status = pthread_mutex_lock (&mutex);
+    if (status != 0)
+        err_abort (status, "Lock mutex");
+    while (counter < 5) {
+        status = pthread_cond_wait (&cond, &mutex);
+        if (status != 0)
+            err_abort (status, "Wait on condition");
+    }
+    status = pthread_mutex_unlock (&mutex);
+    if (status != 0)
+        err_abort (status, "Unlock mutex");
+
+#endif /* Sun */
+    return 0;
+}