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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-04-30 13:12:54 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-05-19 12:00:46 +0200 |
| commit | cc18d7bec7b3c5515cb9e6cd9771d4b94309b3bd (patch) | |
| tree | 59fd8c8ca70830762e632e255a2078f22ac6a821 /cpukit/posix/src/mqueuerecvsupp.c | |
| parent | score: Delete _CORE_message_queue_Flush_support() (diff) | |
| download | rtems-cc18d7bec7b3c5515cb9e6cd9771d4b94309b3bd.tar.bz2 | |
score: Fine grained locking for message queues
Aggregate several critical sections into a bigger one. Sending and
receiving messages is now protected by an ISR lock. Thread dispatching
is only disabled in case a blocking operation is necessary. The message
copy procedure is done inside the critical section (interrupts
disabled). Thus this change may have a negative impact on the interrupt
latency in case very large messages are transferred.
Update #2273.
Diffstat (limited to 'cpukit/posix/src/mqueuerecvsupp.c')
| -rw-r--r-- | cpukit/posix/src/mqueuerecvsupp.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/cpukit/posix/src/mqueuerecvsupp.c b/cpukit/posix/src/mqueuerecvsupp.c index bea19fe9ca..2f9bb2d276 100644 --- a/cpukit/posix/src/mqueuerecvsupp.c +++ b/cpukit/posix/src/mqueuerecvsupp.c @@ -54,20 +54,25 @@ ssize_t _POSIX_Message_queue_Receive_support( size_t length_out; bool do_wait; Thread_Control *executing; + ISR_lock_Context lock_context; - the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location ); + the_mq_fd = _POSIX_Message_queue_Get_fd_interrupt_disable( + mqdes, + &location, + &lock_context + ); switch ( location ) { case OBJECTS_LOCAL: if ( (the_mq_fd->oflag & O_ACCMODE) == O_WRONLY ) { - _Objects_Put( &the_mq_fd->Object ); + _ISR_lock_ISR_enable( &lock_context ); rtems_set_errno_and_return_minus_one( EBADF ); } the_mq = the_mq_fd->Queue; if ( msg_len < the_mq->Message_queue.maximum_message_size ) { - _Objects_Put( &the_mq_fd->Object ); + _ISR_lock_ISR_enable( &lock_context ); rtems_set_errno_and_return_minus_one( EMSGSIZE ); } @@ -97,10 +102,10 @@ ssize_t _POSIX_Message_queue_Receive_support( msg_ptr, &length_out, do_wait, - timeout + timeout, + &lock_context ); - _Objects_Put( &the_mq_fd->Object ); if (msg_prio) { *msg_prio = _POSIX_Message_queue_Priority_from_core( executing->Wait.count |