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add more comments and call portYIELD when necessary

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This commit is contained in:
Liu Zhi Fu 2016-12-15 15:06:00 +08:00
parent 5e2ae7ac19
commit 55726385a4
1 changed files with 13 additions and 1 deletions
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14
components/lwip/port/freertos/sys_arch.c
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@ -43,6 +43,7 @@
#define SYS_THREAD_MAX 4
static bool g_lwip_in_critical_section = false;
static BaseType_t g_lwip_critical_section_needs_taskswitch;
#if !LWIP_COMPAT_MUTEX
/** Create a new mutex
@ -125,7 +126,14 @@ void
sys_sem_signal(sys_sem_t *sem)
{
if (g_lwip_in_critical_section){
xSemaphoreGiveFromISR(*sem, NULL);
/* In function event_callback in sockets.c, lwip signals a semaphore inside a critical
* section. According to the FreeRTOS documentation for FreertosTaskEnterCritical, it's
* not allowed to call any FreeRTOS API function within a critical region. Unfortunately,
* it's not feasible to rework the affected region in LWIP. As a solution, when in a
* critical region, we call xSemaphoreGiveFromISR. This routine is hand-vetted to work
* in a critical region and it will not cause a task switch.
*/
xSemaphoreGiveFromISR(*sem, &g_lwip_critical_section_needs_taskswitch);
} else {
xSemaphoreGive(*sem);
}
@ -476,6 +484,10 @@ sys_arch_unprotect(sys_prot_t pval)
(void) pval;
g_lwip_in_critical_section = false;
portEXIT_CRITICAL(&g_lwip_mux);
if (g_lwip_critical_section_needs_taskswitch){
g_lwip_critical_section_needs_taskswitch = 0;
portYIELD();
}
}
/*-----------------------------------------------------------------------------------*/