Lwip 邮箱

这里简单分析总结一下Lwip sys_arch.c 中的信号量、邮箱、进程相关的内容。系统用的是FreeRTOS。 [c] “sys_arch.c” /* An array to hold the memory for the available semaphores. */ static sem_t sems[SYS_SEM_MAX]; /* An array to hold the memory for the available mailboxes. */ static mbox_t mboxes[SYS_MBOX_MAX]; “sys_arch.h” ///* A structure to hold the variables for a sys_sem_t. */ typedef struct { xQueueHandle queue; signed char buffer[sizeof(void *) + portQUEUE_OVERHEAD_BYTES]; } sem_t; /* A structure to hold the variables for a sys_mbox_t. */ typedef struct { xQueueHandle queue; signed char buffer[(sizeof(void *) * MBOX_MAX) + portQUEUE_OVERHEAD_BYTES]; } mbox_t; [/c] 这里创建了两个全局结构体数组来管理semaphores and mailboxes.