94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*
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* Copyright(c) 2006 to 2019 ZettaScale Technology and others
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*
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* This program and the accompanying materials are made available under the
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* terms of the Eclipse Public License v. 2.0 which is available at
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* http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
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* v. 1.0 which is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
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*/
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#ifndef DDSRT_SYNC_FREERTOS_H
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#define DDSRT_SYNC_FREERTOS_H
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#include <FreeRTOS.h>
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#include <semphr.h>
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#include <task.h>
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#include <stddef.h>
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#include "dds/ddsrt/atomics.h"
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#if (INCLUDE_vTaskSuspend != 1)
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/* INCLUDE_vTaskSuspend must be set to 1 to make xSemaphoreTake wait
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indefinitely when passed portMAX_DELAY. See reference manual. */
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#error "INCLUDE_vTaskSuspend != 1 in FreeRTOSConfig.h"
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#endif
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#if defined (__cplusplus)
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extern "C" {
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#endif
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typedef struct {
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SemaphoreHandle_t sem;
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} ddsrt_mutex_t;
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typedef struct {
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size_t len;
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size_t cnt;
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size_t off;
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size_t end;
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TaskHandle_t *tasks;
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} ddsrt_tasklist_t;
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typedef struct {
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SemaphoreHandle_t sem;
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ddsrt_tasklist_t tasks;
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} ddsrt_cond_t;
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/* This readers-writer lock implementation does not prefer writers over readers
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or vice versa. Multiple readers are allowed to hold the lock simultaneously
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and can acquire it directly if no writers are queued. However, if a writer
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is queued, new readers and writers are queued behind it in order. Any reader
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that acquires the lock after a writer frees it, notifies the next task. If
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that task tries to acquire a write lock it waits until the reader frees the
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lock. However, if the task tries to acquire a read lock it will succeed, and
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notify the next task, etc. */
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typedef struct {
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SemaphoreHandle_t sem;
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ddsrt_tasklist_t tasks;
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int32_t state;
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uint32_t cnt;
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uint32_t rdcnt;
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uint32_t wrcnt;
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} ddsrt_rwlock_t;
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typedef ddsrt_atomic_uint32_t ddsrt_once_t;
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#define DDSRT_ONCE_INIT { .v = (1<<0) /* ONCE_NOT_STARTED */ }
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/* The declarations below are here for tests and must be considered private. */
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/* Number of buckets to grow buffer by. */
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#define DDSRT_TASKLIST_CHUNK (5)
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/* Number of buckets to allocate initially. */
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#define DDSRT_TASKLIST_INITIAL (DDSRT_TASKLIST_CHUNK * 2)
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int ddsrt_tasklist_init(ddsrt_tasklist_t *list);
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void ddsrt_tasklist_fini(ddsrt_tasklist_t *list);
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void ddsrt_tasklist_ltrim(ddsrt_tasklist_t *list);
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void ddsrt_tasklist_rtrim(ddsrt_tasklist_t *list);
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void ddsrt_tasklist_pack(ddsrt_tasklist_t *list);
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int ddsrt_tasklist_shrink(ddsrt_tasklist_t *list);
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int ddsrt_tasklist_grow(ddsrt_tasklist_t *list);
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ssize_t ddsrt_tasklist_find(ddsrt_tasklist_t *list, TaskHandle_t task);
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TaskHandle_t ddsrt_tasklist_peek(ddsrt_tasklist_t *list, TaskHandle_t task);
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TaskHandle_t ddsrt_tasklist_pop(ddsrt_tasklist_t *list, TaskHandle_t task);
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int ddsrt_tasklist_push(ddsrt_tasklist_t *list, TaskHandle_t task);
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#if defined (__cplusplus)
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}
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#endif
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#endif /* DDSRT_SYNC_FREERTOS_H */
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