2001-06-25 Ross Johnson <rpj@setup1.ise.canberra.edu.au>

        * create.c (pthread_create): Add priority inheritance
        attributes.
        * mutex.c (pthread_mutex_lock): Remove some overhead for
        PTHREAD_MUTEX_NORMAL mutex types. Specifically, avoid
        calling pthread_self() and pthread_equal() to check/set
        the mutex owner. Introduce a new pseudo owner for this
        type. Test results suggest increases in speed of up to
        90% for non-blocking locks.
        This is the default type of mutex used internally by other
        synchronising objects, ie. condition variables and
        read-write locks. The test rwlock7.c shows about a
        30-35% speed increase over snapshot 2001-06-06. The
        price of this is that the application developer
        must ensure correct behaviour, or explicitly set the
        mutex to a safer type such as PTHREAD_MUTEX_ERRORCHECK.
        For example, PTHREAD_MUTEX_NORMAL (or PTHREAD_MUTEX_DEFAULT)
        type mutexes will not return an error if a thread which is not
        the owner calls pthread_mutex_unlock. The call will succeed
        in unlocking the mutex if it is currently locked, but a
        subsequent unlock by the true owner will then fail with EPERM.
        This is however consistent with some other implementations.
        (pthread_mutex_unlock): Likewise.
        (pthread_mutex_trylock): Likewise.
        (pthread_mutex_destroy): Likewise.
        * attr.c (pthread_attr_init): PTHREAD_EXPLICIT_SCHED is the
        default inheritance attribute; THREAD_PRIORITY_NORMAL is
        the default priority for new threads.
        * sched.c (pthread_attr_setschedpolicy): Added routine.
        (pthread_attr_getschedpolicy): Added routine.
        (pthread_attr_setinheritsched): Added routine.
        (pthread_attr_getinheritsched): Added routine.
        * pthread.h (sched_rr_set_interval): Added as a macro;
        returns -1 with errno set to ENOSYS.

2001-06-23  Ross Johnson  <rpj@setup1.ise.canberra.edu.au>

        *sched.c (pthread_attr_setschedparam): Add priority range
        check.
        (sched_setscheduler): New function; checks for a valid
        pid and policy; checks for permission to set information
        in the target process; expects pid to be a Win32 process ID,
        not a process handle; the only scheduler policy allowed is
        SCHED_OTHER.
        (sched_getscheduler): Likewise, but checks for permission
        to query.
        * pthread.h (SCHED_*): Moved to sched.h as defined in the
        POSIX standard.
        * sched.h (SCHED_*): Moved from pthread.h.
        (pid_t): Defined if necessary.
        (sched_setscheduler): Defined.
        (sched_getscheduler): Defined.
        * pthread.def (sched_setscheduler): Exported.
        (sched_getscheduler): Likewise.

2001-06-23  Ross Johnson  <rpj@setup1.ise.canberra.edu.au>

        Contributed by -  Ralf Brese <Ralf.Brese@pdb4.siemens.de>

        * create.c (pthread_create): Set thread priority from
        thread attributes.

1 files changed, 99 insertions, 0 deletions

diff --git a/tests/inherit1.c b/tests/inherit1.c
new file mode 100644
index 0000000..a909eb7
--- /dev/null
+++ b/tests/inherit1.c
@@ -0,0 +1,99 @@
+/*
+ * File: inherit1.c
+ *
+ * Test Synopsis:
+ * - Test thread priority inheritance.
+ *
+ * Test Method (Validation or Falsification):
+ * - 
+ *
+ * Requirements Tested:
+ * -
+ *
+ * Features Tested:
+ * -
+ *
+ * Cases Tested:
+ * -
+ *
+ * Description:
+ * -
+ *
+ * Environment:
+ * -
+ *
+ * Input:
+ * - None.
+ *
+ * Output:
+ * - File name, Line number, and failed expression on failure.
+ * - No output on success.
+ *
+ * Assumptions:
+ * -
+ *
+ * Pass Criteria:
+ * - Process returns zero exit status.
+ *
+ * Fail Criteria:
+ * - Process returns non-zero exit status.
+ */
+
+#include "test.h"
+
+void * func(void * arg)
+{
+  int policy;
+  struct sched_param param;
+
+  assert(pthread_getschedparam(pthread_self(), &policy, &param) == 0);
+  return (void *) param.sched_priority;
+}
+
+int
+main()
+{
+  pthread_t t;
+  pthread_t mainThread = pthread_self();
+  pthread_attr_t attr;
+  void * result = NULL;
+  struct sched_param param;
+  struct sched_param mainParam;
+  int maxPrio;
+  int minPrio;
+  int prio;
+  int policy;
+  int inheritsched = -1;
+
+  assert((maxPrio = sched_get_priority_max(SCHED_OTHER)) != -1);
+  assert((minPrio = sched_get_priority_min(SCHED_OTHER)) != -1);
+
+  assert(pthread_attr_init(&attr) == 0);
+  assert(pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED) == 0);
+  assert(pthread_attr_getinheritsched(&attr, &inheritsched) == 0);
+  assert(inheritsched == PTHREAD_INHERIT_SCHED);
+
+  for (prio = minPrio; prio < maxPrio; prio++)
+    {
+      mainParam.sched_priority = prio;
+
+      /* Change the main thread priority */
+      assert(pthread_setschedparam(mainThread, SCHED_OTHER, &mainParam) == 0);
+      assert(pthread_getschedparam(mainThread, &policy, &mainParam) == 0);
+      assert(policy == SCHED_OTHER);
+      assert(mainParam.sched_priority == prio);
+
+      for (param.sched_priority = prio;
+           param.sched_priority <= maxPrio;
+           param.sched_priority++)
+        {
+          /* The new thread create should ignore this new priority */
+          assert(pthread_attr_setschedparam(&attr, &param) == 0);
+          assert(pthread_create(&t, &attr, func, NULL) == 0);
+          pthread_join(t, &result);
+          assert((int) result == mainParam.sched_priority);
+        }
+    }
+
+  return 0;
+}