Toyomasa Watarai / simple-mbed-cloud-client

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Dependents:  

mbed-cloud-client/update-client-hub/modules/atomic-queue/source/critical-posix.c@0:276e7a263c35, 2018-07-02 (annotated)

Committer:
MACRUM
Date:
Mon Jul 02 06:30:39 2018 +0000
Revision:
0:276e7a263c35
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MACRUM 0:276e7a263c35 1 // ----------------------------------------------------------------------------
MACRUM 0:276e7a263c35 2 // Copyright 2015-2017 ARM Ltd.
MACRUM 0:276e7a263c35 3 //
MACRUM 0:276e7a263c35 4 // SPDX-License-Identifier: Apache-2.0
MACRUM 0:276e7a263c35 5 //
MACRUM 0:276e7a263c35 6 // Licensed under the Apache License, Version 2.0 (the "License");
MACRUM 0:276e7a263c35 7 // you may not use this file except in compliance with the License.
MACRUM 0:276e7a263c35 8 // You may obtain a copy of the License at
MACRUM 0:276e7a263c35 9 //
MACRUM 0:276e7a263c35 10 // http://www.apache.org/licenses/LICENSE-2.0
MACRUM 0:276e7a263c35 11 //
MACRUM 0:276e7a263c35 12 // Unless required by applicable law or agreed to in writing, software
MACRUM 0:276e7a263c35 13 // distributed under the License is distributed on an "AS IS" BASIS,
MACRUM 0:276e7a263c35 14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MACRUM 0:276e7a263c35 15 // See the License for the specific language governing permissions and
MACRUM 0:276e7a263c35 16 // limitations under the License.
MACRUM 0:276e7a263c35 17 // ----------------------------------------------------------------------------
MACRUM 0:276e7a263c35 18
MACRUM 0:276e7a263c35 19 #if defined(TARGET_LIKE_POSIX) && !defined(ATOMIC_QUEUE_USE_PAL)
MACRUM 0:276e7a263c35 20
MACRUM 0:276e7a263c35 21 // It's probably a better idea to define _POSIX_SOURCE in the target description
MACRUM 0:276e7a263c35 22 #ifndef _XOPEN_SOURCE
MACRUM 0:276e7a263c35 23 #define _XOPEN_SOURCE 600
MACRUM 0:276e7a263c35 24 #endif
MACRUM 0:276e7a263c35 25
MACRUM 0:276e7a263c35 26 #include <stdint.h>
MACRUM 0:276e7a263c35 27 #include <assert.h>
MACRUM 0:276e7a263c35 28 #include <unistd.h>
MACRUM 0:276e7a263c35 29 #include <signal.h>
MACRUM 0:276e7a263c35 30 #include <pthread.h>
MACRUM 0:276e7a263c35 31
MACRUM 0:276e7a263c35 32 // Module include
MACRUM 0:276e7a263c35 33 #include "aq_critical.h"
MACRUM 0:276e7a263c35 34
MACRUM 0:276e7a263c35 35 static pthread_mutex_t* get_mutex() {
MACRUM 0:276e7a263c35 36 static int initialized = 0;
MACRUM 0:276e7a263c35 37 static pthread_mutex_t Mutex;
MACRUM 0:276e7a263c35 38 if (!initialized)
MACRUM 0:276e7a263c35 39 {
MACRUM 0:276e7a263c35 40 pthread_mutexattr_t Attr;
MACRUM 0:276e7a263c35 41 pthread_mutexattr_init(&Attr);
MACRUM 0:276e7a263c35 42 pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
MACRUM 0:276e7a263c35 43 pthread_mutex_init(&Mutex, &Attr);
MACRUM 0:276e7a263c35 44 initialized = 1;
MACRUM 0:276e7a263c35 45 }
MACRUM 0:276e7a263c35 46 return &Mutex;
MACRUM 0:276e7a263c35 47 }
MACRUM 0:276e7a263c35 48
MACRUM 0:276e7a263c35 49 static volatile unsigned irq_nesting_depth = 0;
MACRUM 0:276e7a263c35 50 static sigset_t old_sig_set;
MACRUM 0:276e7a263c35 51
MACRUM 0:276e7a263c35 52 void aq_critical_section_enter() {
MACRUM 0:276e7a263c35 53 pthread_mutex_lock(get_mutex());
MACRUM 0:276e7a263c35 54 if (++irq_nesting_depth == 1) {
MACRUM 0:276e7a263c35 55 int rc;
MACRUM 0:276e7a263c35 56 sigset_t full_set;
MACRUM 0:276e7a263c35 57 rc = sigfillset(&full_set);
MACRUM 0:276e7a263c35 58 assert(rc == 0);
MACRUM 0:276e7a263c35 59 rc = sigprocmask(SIG_BLOCK, &full_set, &old_sig_set);
MACRUM 0:276e7a263c35 60 assert(rc == 0);
MACRUM 0:276e7a263c35 61 }
MACRUM 0:276e7a263c35 62 }
MACRUM 0:276e7a263c35 63
MACRUM 0:276e7a263c35 64 void aq_critical_section_exit() {
MACRUM 0:276e7a263c35 65 assert(irq_nesting_depth > 0);
MACRUM 0:276e7a263c35 66 if (--irq_nesting_depth == 0) {
MACRUM 0:276e7a263c35 67 int rc = sigprocmask(SIG_SETMASK, &old_sig_set, NULL);
MACRUM 0:276e7a263c35 68 assert(rc == 0);
MACRUM 0:276e7a263c35 69 }
MACRUM 0:276e7a263c35 70 pthread_mutex_unlock(get_mutex());
MACRUM 0:276e7a263c35 71 }
MACRUM 0:276e7a263c35 72 #endif // defined(TARGET_LIKE_POSIX)