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/sched_thread.c
+++ b/sched_thread.c
@@ -0,0 +1,88 @@
+/*
+ * sched_thread.c
+ *
+ * Demonstrate dynamic scheduling policy use.
+ *
+ * Special note: This demonstration will fail on Solaris 2.5
+ * because it does not implement SCHED_RR.
+ */
+#include <unistd.h>
+#include <pthread.h>
+#include <sched.h>
+#include "errors.h"
+
+#define THREADS 5
+
+/*
+ * Structure describing each thread.
+ */
+typedef struct thread_tag {
+    int         index;
+    pthread_t   id;
+} thread_t;
+
+thread_t        threads[THREADS];
+int             rr_min_priority;
+
+/*
+ * Thread start routine that will set its own priority
+ */
+void *thread_routine (void *arg)
+{
+    thread_t *self = (thread_t*)arg;
+    int my_policy;
+    struct sched_param my_param;
+    int status;
+
+    my_param.sched_priority = rr_min_priority + self->index;
+    DPRINTF ((
+        "Thread %d will set SCHED_FIFO, priority %d\n",
+        self->index, my_param.sched_priority));
+    status = pthread_setschedparam (
+        self->id, SCHED_RR, &my_param);
+    if (status != 0)
+        err_abort (status, "Set sched");
+    status = pthread_getschedparam (
+        self->id, &my_policy, &my_param);
+    if (status != 0)
+        err_abort (status, "Get sched");
+    printf ("thread_routine %d running at %s/%d\n",
+        self->index,
+        (my_policy == SCHED_FIFO ? "FIFO"
+            : (my_policy == SCHED_RR ? "RR"
+            : (my_policy == SCHED_OTHER ? "OTHER"
+            : "unknown"))),
+        my_param.sched_priority);
+    return NULL;
+}
+
+int main (int argc, char *argv[])
+{
+    int count, status;
+
+    rr_min_priority = sched_get_priority_min (SCHED_RR);
+    if (rr_min_priority == -1) {
+#ifdef sun
+        if (errno == ENOSYS) {
+            fprintf (stderr, "SCHED_RR is not supported.\n");
+            exit (0);
+        }
+#endif
+        errno_abort ("Get SCHED_RR min priority");
+    }
+    for (count = 0; count < THREADS; count++) {
+        threads[count].index = count;
+        status = pthread_create (
+            &threads[count].id, NULL,
+            thread_routine, (void*)&threads[count]);
+        if (status != 0)
+            err_abort (status, "Create thread");
+    }
+    for (count = 0; count < THREADS; count++) {
+        status = pthread_join (threads[count].id, NULL);
+        if (status != 0)
+            err_abort (status, "Join thread");
+    }
+    printf ("Main exiting\n");
+    return 0;
+}