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main_arena是什么东西？
来源: 互联网 发布时间：2016-05-21
本文导语: #0 0x0086a159 in main_arena () from /lib/libc.so.6 #1 0x0806751a in fun_name_a (this=0xa7537e0, r=ReleaseMe, p=0xa83c6a0) at filename.cxx:1945 #2 0x0806db99 in fun_name_b (pB=0xa7537e0) at filename.cxx:2184 #3 0x008a343b in start_thread ...
#0 0x0086a159 in main_arena () from /lib/libc.so.6
#1 0x0806751a in fun_name_a (this=0xa7537e0, r=ReleaseMe,
p=0xa83c6a0) at filename.cxx:1945
#2 0x0806db99 in fun_name_b (pB=0xa7537e0)
at filename.cxx:2184
#3 0x008a343b in start_thread () from /lib/libpthread.so.0
#4 0x007fafde in clone () from /lib/libc.so.6
#1 0x0806751a in fun_name_a (this=0xa7537e0, r=ReleaseMe,
p=0xa83c6a0) at filename.cxx:1945
#2 0x0806db99 in fun_name_b (pB=0xa7537e0)
at filename.cxx:2184
#3 0x008a343b in start_thread () from /lib/libpthread.so.0
#4 0x007fafde in clone () from /lib/libc.so.6
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这是malloc()实现过程中的一个结构体，具体代码如下：
/* There are several instances of this struct ("arenas") in this
malloc. If you are adapting this malloc in a way that does NOT use
a static or mmapped malloc_state, you MUST explicitly zero-fill it
before using. This malloc relies on the property that malloc_state
is initialized to all zeroes (as is true of C statics). */
static struct malloc_state main_arena;
/*
----------- Internal state representation and initialization -----------
*/
struct malloc_state {
/* Serialize access. */
mutex_t mutex;
/* Flags (formerly in max_fast). */
int flags;
#if THREAD_STATS
/* Statistics for locking. Only used if THREAD_STATS is defined. */
long stat_lock_direct, stat_lock_loop, stat_lock_wait;
#endif
/* Fastbins */
mfastbinptr fastbins[NFASTBINS];
/* Base of the topmost chunk -- not otherwise kept in a bin */
mchunkptr top;
/* The remainder from the most recent split of a small request */
mchunkptr last_remainder;
/* Normal bins packed as described above */
mchunkptr bins[NBINS * 2 - 2];
/* Bitmap of bins */
unsigned int binmap[BINMAPSIZE];
/* Linked list */
struct malloc_state *next;
/* Memory allocated from the system in this arena. */
INTERNAL_SIZE_T system_mem;
INTERNAL_SIZE_T max_system_mem;
};
|
晕,这是什么?
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