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Make locks more reliable

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This change switches most of the core locks to be re-entrant, in order
to reduce the chance of deadlocking code that does, clever things with
asynchronous signal handlers. This change implements it it in pthreads
so we're one step closer to having a standardized threading primitives
This commit is contained in:
Justine Tunney 2022-06-11 01:59:26 -07:00
parent 5ea618f0af
commit c260345e06
35 changed files with 369 additions and 258 deletions
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6
libc/runtime/memtrack.internal.h
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@ -3,6 +3,7 @@
#include "libc/assert.h"
#include "libc/bits/midpoint.h"
#include "libc/dce.h"
#include "libc/intrin/pthread.h"
#include "libc/macros.internal.h"
#include "libc/nt/version.h"
#include "libc/runtime/stack.h"
@ -30,6 +31,9 @@ COSMOPOLITAN_C_START_
#define _kMem(NORMAL, WIN7) \
(!IsWindows() || IsAtLeastWindows10() ? NORMAL : WIN7)
#define __mmi_lock() pthread_mutex_lock(&_mmi.lock)
#define __mmi_unlock() pthread_mutex_unlock(&_mmi.lock)
struct MemoryInterval {
int x;
int y;
@ -46,7 +50,7 @@ struct MemoryIntervals {
size_t i, n;
struct MemoryInterval *p;
struct MemoryInterval s[OPEN_MAX];
_Alignas(64) int lock;
pthread_mutex_t lock;
};
extern hidden struct MemoryIntervals _mmi;