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445db75612
The Linux target's sys/lock.h provided no-op inline stubs, which was safe only under the assumption of single-threaded execution. With the new FreeRTOS Linux simulator using soft preemption, an outgoing task can still run concurrently with the incoming task until it reaches a yield point, making no-op locks unsafe. Replace the no-op implementation with real pthread mutexes: - Change _lock_t from `typedef int` to `typedef void *` (pointer to a heap-allocated pthread_mutex_t). - Implement all _lock_* functions in a new lock.c, supporting both normal and recursive mutexes. - Zero-initialized locks are lazily created on first acquire using double-checked locking, preserving newlib/esp_libc semantics. - Add lock.c unconditionally to the linux component sources and link pthread.
38 lines
897 B
C
38 lines
897 B
C
/*
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* SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __SYS_LOCK_H__
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#define __SYS_LOCK_H__
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Lock type backed by pthread mutexes. A zero-initialized _lock_t is valid
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* and will be lazily created on first acquire (matching newlib/esp_libc
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* semantics).
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*/
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typedef void * _lock_t;
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void _lock_init(_lock_t *plock);
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void _lock_init_recursive(_lock_t *plock);
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void _lock_close(_lock_t *plock);
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void _lock_close_recursive(_lock_t *plock);
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void _lock_acquire(_lock_t *plock);
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void _lock_acquire_recursive(_lock_t *plock);
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int _lock_try_acquire(_lock_t *plock);
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int _lock_try_acquire_recursive(_lock_t *plock);
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void _lock_release(_lock_t *plock);
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void _lock_release_recursive(_lock_t *plock);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SYS_LOCK_H__ */
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