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+ Updated comments.

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+ Corrected enable/disable of dispatch.
This commit is contained in:
Jennifer Averett
1999-11-22 16:12:19 +00:00
parent 94f81bbd8b
commit 2545646beb
2 changed files with 40 additions and 18 deletions
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29
c/src/exec/posix/src/semopen.c
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@@ -17,6 +17,11 @@
#include <rtems/posix/seterr.h>
/*PAGE
*
* sem_open
*
* Opens a named semaphore. Used in conjunction with the sem_close
* and sem_unlink commands.
*
* 11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221
*
@@ -39,7 +44,8 @@ sem_t *sem_open(
Objects_Id the_semaphore_id;
POSIX_Semaphore_Control *the_semaphore;
Objects_Locations location;
_Thread_Disable_dispatch();
if ( oflag & O_CREAT ) {
va_start(arg, oflag);
@@ -60,16 +66,14 @@ sem_t *sem_open(
if ( status ) {
/*
* Unless we are willing to create name -> ID translation failure is
* an error.
* Unless provided a valid name that did not already exist
* and we are willing to create then it is an error.
*/
if ( status == EINVAL ) {
if ( !(oflag & O_CREAT) ) {
set_errno_and_return_minus_one_cast( ENOENT, sem_t * );
}
if ( !( status == ENOENT && (oflag & O_CREAT) ) ) {
_Thread_Enable_dispatch();
set_errno_and_return_minus_one_cast( status, sem_t * );
}
} else {
/*
@@ -77,11 +81,14 @@ sem_t *sem_open(
*/
if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) {
_Thread_Enable_dispatch();
set_errno_and_return_minus_one_cast( EEXIST, sem_t * );
}
the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location );
the_semaphore->open_count += 1;
_Thread_Enable_dispatch();
_Thread_Enable_dispatch();
return (sem_t *)&the_semaphore->Object.id;
}
@@ -91,7 +98,7 @@ sem_t *sem_open(
* checked. We should go ahead and create a semaphore.
*/
status = _POSIX_Semaphore_Create_support(
status =_POSIX_Semaphore_Create_support(
name,
FALSE, /* not shared across processes */
value,
@@ -102,8 +109,12 @@ sem_t *sem_open(
* errno was set by Create_support, so don't set it again.
*/
_Thread_Enable_dispatch();
if ( status == -1 )
return SEM_FAILED;
return (sem_t *) &the_semaphore->Object.id;
}