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lwip: implement lwip critical session with mutex

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Currently lwip critical session is based on interrupt, now replace it with mutex
This commit is contained in:
Liu Zhi Fu 2017-03-20 16:30:35 +08:00
parent 74d0edec0f
commit 778a475136
1 changed files with 12 additions and 27 deletions
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39
components/lwip/port/freertos/sys_arch.c
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@ -38,12 +38,13 @@
#include "lwip/mem.h"
#include "arch/sys_arch.h"
#include "lwip/stats.h"
#include "esp_log.h"
/* This is the number of threads that can be started with sys_thread_new() */
#define SYS_THREAD_MAX 4
#define TAG "lwip_arch"
static bool g_lwip_in_critical_section = false;
static BaseType_t g_lwip_critical_section_needs_taskswitch;
static sys_mutex_t g_lwip_protect_mutex = NULL;
#if !LWIP_COMPAT_MUTEX
/** Create a new mutex
@ -125,18 +126,7 @@ sys_sem_new(sys_sem_t *sem, u8_t count)
void
sys_sem_signal(sys_sem_t *sem)
{
if (g_lwip_in_critical_section){
/* 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);
}
}
/*-----------------------------------------------------------------------------------*/
@ -394,7 +384,7 @@ sys_mbox_free(sys_mbox_t *mbox)
}
if (count == (MAX_POLL_CNT-1)){
printf("WARNING: mbox %p had a consumer who never unblocked. Leaking!\n", (*mbox)->os_mbox);
ESP_LOGW(TAG, "WARNING: mbox %p had a consumer who never unblocked. Leaking!\n", (*mbox)->os_mbox);
}
sys_delay_ms(PER_POLL_DELAY);
}
@ -440,6 +430,9 @@ sys_thread_new(const char *name, lwip_thread_fn thread, void *arg, int stacksize
void
sys_init(void)
{
if (ERR_OK != sys_mutex_new(&g_lwip_protect_mutex)) {
ESP_LOGE(TAG, "sys_init: failed to init lwip protect mutex\n");
}
}
/*-----------------------------------------------------------------------------------*/
@ -449,7 +442,6 @@ sys_now(void)
return xTaskGetTickCount();
}
static portMUX_TYPE g_lwip_mux = portMUX_INITIALIZER_UNLOCKED;
/*
This optional function does a "fast" critical region protection and returns
the previous protection level. This function is only called during very short
@ -466,8 +458,7 @@ static portMUX_TYPE g_lwip_mux = portMUX_INITIALIZER_UNLOCKED;
sys_prot_t
sys_arch_protect(void)
{
portENTER_CRITICAL(&g_lwip_mux);
g_lwip_in_critical_section = true;
sys_mutex_lock(&g_lwip_protect_mutex);
return (sys_prot_t) 1;
}
@ -481,13 +472,7 @@ sys_arch_protect(void)
void
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();
}
sys_mutex_unlock(&g_lwip_protect_mutex);
}
/*-----------------------------------------------------------------------------------*/
@ -497,7 +482,7 @@ sys_arch_unprotect(sys_prot_t pval)
void
sys_arch_assert(const char *file, int line)
{
printf("\nAssertion: %d in %s\n", line, file);
ESP_LOGE(TAG, "\nAssertion: %d in %s\n", line, file);
// vTaskEnterCritical();
while(1);
@ -537,14 +522,14 @@ sys_sem_t* sys_thread_sem_init(void)
sys_sem_t *sem = (sys_sem_t*)malloc(sizeof(sys_sem_t*));
if (!sem){
printf("sem f1\n");
ESP_LOGE(TAG, "thread_sem_init: out of memory");
return 0;
}
*sem = xSemaphoreCreateBinary();
if (!(*sem)){
free(sem);
printf("sem f2\n");
ESP_LOGE(TAG, "thread_sem_init: out of memory");
return 0;
}