From 9f95a19a57f0f85212c320327636e93d70bbecc8 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 2 Nov 1999 18:35:52 +0000
Subject: Split time.c into multiple files.

---
 cpukit/posix/src/nanosleep.c | 100 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 cpukit/posix/src/nanosleep.c

(limited to 'cpukit/posix/src/nanosleep.c')

diff --git a/cpukit/posix/src/nanosleep.c b/cpukit/posix/src/nanosleep.c
new file mode 100644
index 0000000000..7930c016e5
--- /dev/null
+++ b/cpukit/posix/src/nanosleep.c
@@ -0,0 +1,100 @@
+/*
+ *  $Id$
+ */
+
+#include <assert.h>
+#include <time.h>
+#include <errno.h>
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/tod.h>
+
+#include <rtems/posix/seterr.h>
+#include <rtems/posix/time.h>
+
+/*PAGE
+ *
+ *  14.2.5 High Resolution Sleep, P1003.1b-1993, p. 269
+ */
+
+int nanosleep(
+  const struct timespec  *rqtp,
+  struct timespec        *rmtp
+)
+{
+  Watchdog_Interval  ticks;
+  struct timespec   *the_rqtp;
+
+  if ( !rqtp )
+    set_errno_and_return_minus_one( EINVAL );
+
+  the_rqtp = (struct timespec *)rqtp;
+
+  /*
+   *  Return EAGAIN if the delay interval is negative.  
+   *
+   *  NOTE:  This behavior is beyond the POSIX specification.  
+   *         FSU pthreads shares this behavior.
+   */
+
+  if ( the_rqtp->tv_sec < 0 )
+    the_rqtp->tv_sec = 0;
+
+  if ( /* the_rqtp->tv_sec < 0 || */ the_rqtp->tv_nsec < 0 )
+    set_errno_and_return_minus_one( EAGAIN );
+
+  if ( the_rqtp->tv_nsec >= TOD_NANOSECONDS_PER_SECOND )
+    set_errno_and_return_minus_one( EINVAL );
+ 
+  ticks = _POSIX_Timespec_to_interval( the_rqtp );
+
+  /*
+   *  This behavior is also beyond the POSIX specification but is
+   *  consistent with the RTEMS api and yields desirable behavior.
+   */
+
+  if ( !ticks ) {
+    _Thread_Disable_dispatch();
+      _Thread_Yield_processor();
+    _Thread_Enable_dispatch();
+    if ( rmtp ) {
+       rmtp->tv_sec = 0; 
+       rmtp->tv_nsec = 0; 
+    }
+    return 0;
+  }
+  
+  _Thread_Disable_dispatch();
+    _Thread_Set_state(
+      _Thread_Executing,
+      STATES_DELAYING | STATES_INTERRUPTIBLE_BY_SIGNAL
+    );
+    _Watchdog_Initialize(
+      &_Thread_Executing->Timer,
+      _Thread_Delay_ended,
+      _Thread_Executing->Object.id,
+      NULL
+    );
+    _Watchdog_Insert_ticks( &_Thread_Executing->Timer, ticks );
+  _Thread_Enable_dispatch();
+
+  /* calculate time remaining */
+
+  if ( rmtp ) {
+    ticks -= 
+      _Thread_Executing->Timer.stop_time - _Thread_Executing->Timer.start_time;
+
+    _POSIX_Interval_to_timespec( ticks, rmtp );
+
+    /*
+     *  If there is time remaining, then we were interrupted by a signal.
+     */
+
+    if ( ticks )
+      set_errno_and_return_minus_one( EINTR );
+  }
+
+  return 0;
+}
-- 
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