leo hendrickson / Mbed OS example-Ethernet-mbed-Cloud-connect

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simple-mbed-cloud-client/mbed-cloud-client/update-client-hub/modules/atomic-queue/source/critical-posix.c@0:8f0bb79ddd48, 2021-05-04 (annotated)

Committer:
leothedragon
Date:
Tue May 04 08:55:12 2021 +0000
Revision:
0:8f0bb79ddd48
nmn

Who changed what in which revision?

UserRevisionLine numberNew contents of line
leothedragon 0:8f0bb79ddd48 1 // ----------------------------------------------------------------------------
leothedragon 0:8f0bb79ddd48 2 // Copyright 2015-2017 ARM Ltd.
leothedragon 0:8f0bb79ddd48 3 //
leothedragon 0:8f0bb79ddd48 4 // SPDX-License-Identifier: Apache-2.0
leothedragon 0:8f0bb79ddd48 5 //
leothedragon 0:8f0bb79ddd48 6 // Licensed under the Apache License, Version 2.0 (the "License");
leothedragon 0:8f0bb79ddd48 7 // you may not use this file except in compliance with the License.
leothedragon 0:8f0bb79ddd48 8 // You may obtain a copy of the License at
leothedragon 0:8f0bb79ddd48 9 //
leothedragon 0:8f0bb79ddd48 10 // http://www.apache.org/licenses/LICENSE-2.0
leothedragon 0:8f0bb79ddd48 11 //
leothedragon 0:8f0bb79ddd48 12 // Unless required by applicable law or agreed to in writing, software
leothedragon 0:8f0bb79ddd48 13 // distributed under the License is distributed on an "AS IS" BASIS,
leothedragon 0:8f0bb79ddd48 14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
leothedragon 0:8f0bb79ddd48 15 // See the License for the specific language governing permissions and
leothedragon 0:8f0bb79ddd48 16 // limitations under the License.
leothedragon 0:8f0bb79ddd48 17 // ----------------------------------------------------------------------------
leothedragon 0:8f0bb79ddd48 18
leothedragon 0:8f0bb79ddd48 19 #if defined(TARGET_LIKE_POSIX) && !defined(ATOMIC_QUEUE_USE_PAL)
leothedragon 0:8f0bb79ddd48 20
leothedragon 0:8f0bb79ddd48 21 // It's probably a better idea to define _POSIX_SOURCE in the target description
leothedragon 0:8f0bb79ddd48 22 #ifndef _XOPEN_SOURCE
leothedragon 0:8f0bb79ddd48 23 #define _XOPEN_SOURCE 600
leothedragon 0:8f0bb79ddd48 24 #endif
leothedragon 0:8f0bb79ddd48 25
leothedragon 0:8f0bb79ddd48 26 #include <stdint.h>
leothedragon 0:8f0bb79ddd48 27 #include <assert.h>
leothedragon 0:8f0bb79ddd48 28 #include <unistd.h>
leothedragon 0:8f0bb79ddd48 29 #include <signal.h>
leothedragon 0:8f0bb79ddd48 30 #include <pthread.h>
leothedragon 0:8f0bb79ddd48 31
leothedragon 0:8f0bb79ddd48 32 // Module include
leothedragon 0:8f0bb79ddd48 33 #include "aq_critical.h"
leothedragon 0:8f0bb79ddd48 34
leothedragon 0:8f0bb79ddd48 35 static pthread_mutex_t *get_mutex()
leothedragon 0:8f0bb79ddd48 36 {
leothedragon 0:8f0bb79ddd48 37 static int initialized = 0;
leothedragon 0:8f0bb79ddd48 38 static pthread_mutex_t Mutex;
leothedragon 0:8f0bb79ddd48 39 if (!initialized) {
leothedragon 0:8f0bb79ddd48 40 pthread_mutexattr_t Attr;
leothedragon 0:8f0bb79ddd48 41 pthread_mutexattr_init(&Attr);
leothedragon 0:8f0bb79ddd48 42 pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
leothedragon 0:8f0bb79ddd48 43 pthread_mutex_init(&Mutex, &Attr);
leothedragon 0:8f0bb79ddd48 44 initialized = 1;
leothedragon 0:8f0bb79ddd48 45 }
leothedragon 0:8f0bb79ddd48 46 return &Mutex;
leothedragon 0:8f0bb79ddd48 47 }
leothedragon 0:8f0bb79ddd48 48
leothedragon 0:8f0bb79ddd48 49 static volatile unsigned irq_nesting_depth = 0;
leothedragon 0:8f0bb79ddd48 50 static sigset_t old_sig_set;
leothedragon 0:8f0bb79ddd48 51
leothedragon 0:8f0bb79ddd48 52 void aq_critical_section_enter()
leothedragon 0:8f0bb79ddd48 53 {
leothedragon 0:8f0bb79ddd48 54 pthread_mutex_lock(get_mutex());
leothedragon 0:8f0bb79ddd48 55 if (++irq_nesting_depth == 1) {
leothedragon 0:8f0bb79ddd48 56 int rc;
leothedragon 0:8f0bb79ddd48 57 sigset_t full_set;
leothedragon 0:8f0bb79ddd48 58 rc = sigfillset(&full_set);
leothedragon 0:8f0bb79ddd48 59 assert(rc == 0);
leothedragon 0:8f0bb79ddd48 60 rc = sigprocmask(SIG_BLOCK, &full_set, &old_sig_set);
leothedragon 0:8f0bb79ddd48 61 assert(rc == 0);
leothedragon 0:8f0bb79ddd48 62 }
leothedragon 0:8f0bb79ddd48 63 }
leothedragon 0:8f0bb79ddd48 64
leothedragon 0:8f0bb79ddd48 65 void aq_critical_section_exit(void)
leothedragon 0:8f0bb79ddd48 66 {
leothedragon 0:8f0bb79ddd48 67 assert(irq_nesting_depth > 0);
leothedragon 0:8f0bb79ddd48 68 if (--irq_nesting_depth == 0) {
leothedragon 0:8f0bb79ddd48 69 int rc = sigprocmask(SIG_SETMASK, &old_sig_set, NULL);
leothedragon 0:8f0bb79ddd48 70 assert(rc == 0);
leothedragon 0:8f0bb79ddd48 71 }
leothedragon 0:8f0bb79ddd48 72 pthread_mutex_unlock(get_mutex());
leothedragon 0:8f0bb79ddd48 73 }
leothedragon 0:8f0bb79ddd48 74 #endif // defined(TARGET_LIKE_POSIX)