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Better fix for bug #50838 (mem.c needs SYS_ARCH_PROTECTION around MEM_STATS): only lock where necessary

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This commit is contained in:
goldsimon 2017-04-24 12:23:05 +02:00
parent bd483fa229
commit 16a71473c1
2 changed files with 24 additions and 17 deletions
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32
src/core/mem.c
View File

@ -66,6 +66,10 @@
#include <stdlib.h> /* for malloc()/free() */
#endif
#define MEM_STATS_INC_LOCKED(x) SYS_ARCH_LOCKED(MEM_STATS_INC(x))
#define MEM_STATS_INC_USED_LOCKED(x, y) SYS_ARCH_LOCKED(MEM_STATS_INC_USED(x, y))
#define MEM_STATS_DEC_USED_LOCKED(x, y) SYS_ARCH_LOCKED(MEM_STATS_DEC_USED(x, y))
#if MEM_LIBC_MALLOC || MEM_USE_POOLS
/** mem_init is not used when using pools instead of a heap or using
@ -123,13 +127,13 @@ mem_malloc(mem_size_t size)
{
void* ret = mem_clib_malloc(size + MEM_LIBC_STATSHELPER_SIZE);
if (ret == NULL) {
MEM_STATS_INC(err);
MEM_STATS_INC_LOCKED(err);
} else {
LWIP_ASSERT("malloc() must return aligned memory", LWIP_MEM_ALIGN(ret) == ret);
#if LWIP_STATS && MEM_STATS
*(mem_size_t*)ret = size;
ret = (u8_t*)ret + MEM_LIBC_STATSHELPER_SIZE;
MEM_STATS_INC_USED(used, size);
MEM_STATS_INC_USED_LOCKED(used, size);
#endif
}
return ret;
@ -146,7 +150,7 @@ mem_free(void *rmem)
LWIP_ASSERT("rmem == MEM_ALIGN(rmem)", (rmem == LWIP_MEM_ALIGN(rmem)));
#if LWIP_STATS && MEM_STATS
rmem = (u8_t*)rmem - MEM_LIBC_STATSHELPER_SIZE;
MEM_STATS_DEC_USED(used, *(mem_size_t*)rmem);
MEM_STATS_DEC_USED_LOCKED(used, *(mem_size_t*)rmem);
#endif
mem_clib_free(rmem);
}
@ -183,7 +187,7 @@ mem_malloc(mem_size_t size)
continue;
}
#endif /* MEM_USE_POOLS_TRY_BIGGER_POOL */
MEM_STATS_INC(err);
MEM_STATS_INC_LOCKED(err);
return NULL;
}
break;
@ -191,7 +195,7 @@ mem_malloc(mem_size_t size)
}
if (poolnr > MEMP_POOL_LAST) {
LWIP_ASSERT("mem_malloc(): no pool is that big!", 0);
MEM_STATS_INC(err);
MEM_STATS_INC_LOCKED(err);
return NULL;
}
@ -203,7 +207,7 @@ mem_malloc(mem_size_t size)
#if MEMP_OVERFLOW_CHECK || (LWIP_STATS && MEM_STATS)
/* truncating to u16_t is safe because struct memp_desc::size is u16_t */
element->size = (u16_t)size;
MEM_STATS_INC_USED(used, element->size);
MEM_STATS_INC_USED_LOCKED(used, element->size);
#endif /* MEMP_OVERFLOW_CHECK || (LWIP_STATS && MEM_STATS) */
#if MEMP_OVERFLOW_CHECK
/* initialize unused memory (diff between requested size and selected pool's size) */
@ -235,7 +239,7 @@ mem_free(void *rmem)
LWIP_ASSERT("hmem == MEM_ALIGN(hmem)", (hmem == LWIP_MEM_ALIGN(hmem)));
LWIP_ASSERT("hmem->poolnr < MEMP_MAX", (hmem->poolnr < MEMP_MAX));
MEM_STATS_DEC_USED(used, hmem->size);
MEM_STATS_DEC_USED_LOCKED(used, hmem->size);
#if MEMP_OVERFLOW_CHECK
{
u16_t i;
@ -317,11 +321,11 @@ static volatile u8_t mem_free_count;
#else /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
/* Protect the heap only by using a semaphore */
/* Protect the heap only by using a mutex */
#define LWIP_MEM_FREE_DECL_PROTECT()
#define LWIP_MEM_FREE_PROTECT() sys_mutex_lock(&mem_mutex)
#define LWIP_MEM_FREE_UNPROTECT() sys_mutex_unlock(&mem_mutex)
/* mem_malloc is protected using semaphore AND LWIP_MEM_ALLOC_PROTECT */
/* mem_malloc is protected using mutex AND LWIP_MEM_ALLOC_PROTECT */
#define LWIP_MEM_ALLOC_DECL_PROTECT()
#define LWIP_MEM_ALLOC_PROTECT()
#define LWIP_MEM_ALLOC_UNPROTECT()
@ -431,12 +435,9 @@ mem_free(void *rmem)
(u8_t *)rmem < (u8_t *)ram_end);
if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
SYS_ARCH_DECL_PROTECT(lev);
LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SEVERE, ("mem_free: illegal memory\n"));
/* protect mem stats from concurrent access */
SYS_ARCH_PROTECT(lev);
MEM_STATS_INC(illegal);
SYS_ARCH_UNPROTECT(lev);
MEM_STATS_INC_LOCKED(illegal);
return;
}
/* protect the heap from concurrent access */
@ -500,12 +501,9 @@ mem_trim(void *rmem, mem_size_t newsize)
(u8_t *)rmem < (u8_t *)ram_end);
if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
SYS_ARCH_DECL_PROTECT(lev);
LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SEVERE, ("mem_trim: illegal memory\n"));
/* protect mem stats from concurrent access */
SYS_ARCH_PROTECT(lev);
MEM_STATS_INC(illegal);
SYS_ARCH_UNPROTECT(lev);
MEM_STATS_INC_LOCKED(illegal);
return rmem;
}
/* Get the corresponding struct mem ... */

9
src/include/lwip/sys.h
View File

@ -447,6 +447,15 @@ void sys_arch_unprotect(sys_prot_t pval);
} while(0)
#endif /* SYS_ARCH_SET */
#ifndef SYS_ARCH_LOCKED
#define SYS_ARCH_LOCKED(code) do { \
SYS_ARCH_DECL_PROTECT(old_level); \
SYS_ARCH_PROTECT(old_level); \
code; \
SYS_ARCH_UNPROTECT(old_level); \
} while(0)
#endif /* SYS_ARCH_LOCKED */
#ifdef __cplusplus
}