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fixed bug #21433 (Calling mem_free/pbuf_free from interrupt context isn't safe): set LWIP_USE_HEAP_FROM_INTERRUPT to 1 in lwipopts.h or use tcpip_callback_nonblocking(pbuf_free_int, p)/ tcpip_callback_nonblocking(mem_free, m) to free pbufs or heap memory from interrupt context

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This commit is contained in:
goldsimon
2008-03-27 19:29:35 +00:00
parent 64fa8d78bc
commit 43dd38df0a
5 changed files with 74 additions and 9 deletions
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17
src/include/lwip/opt.h
View File

@@ -155,6 +155,23 @@
#define MEMP_USE_CUSTOM_POOLS 0
#endif
/**
* This is for NO_SYS=0 only; in NO_SYS=1 configurations, the heap may not be accessed
* from interrupt level!
*
* If you want to free PBUF_RAM pbufs (or call mem_free()) from interrupt context,
* the heap cannot be protected by a semaphore. Setting this to 1 will disable
* interrupts while walking the heap.
*
* *** USE THIS WITH CARE: Setting this to 1 can disable interrupts for a long time! ***
*
* If you don't want that, call
* - tcpip_callback_nonblocking(pbuf_free_int, p);
* - tcpip_callback_nonblocking(mem_free, m);
*/
#ifndef LWIP_USE_HEAP_FROM_INTERRUPT
#define LWIP_USE_HEAP_FROM_INTERRUPT 0
#endif
/*
------------------------------------------------

5
src/include/lwip/tcpip.h
View File

@@ -83,7 +83,10 @@ err_t tcpip_netifapi_lock(struct netifapi_msg *netifapimsg);
#endif /* LWIP_NETIF_API */
err_t tcpip_callback_with_block(void (*f)(void *ctx), void *ctx, u8_t block);
#define tcpip_callback(f,ctx) tcpip_callback_with_block(f,ctx,1)
#define tcpip_callback(f, ctx) tcpip_callback_with_block(f, ctx, 1)
#define tcpip_callback_nonblocking(f, ctx) tcpip_callback_with_block(f, ctx, 0)
void pbuf_free_int(struct pbuf *p);
err_t tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg);
#define tcpip_untimeout(h, arg) tcpip_timeout(0xffffffff, h, arg)