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Fix bugs with new memory manager

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This fixes a regression in mmap(MAP_FIXED) on Windows caused by a recent
revision. This change also fixes ZipOS so it no longer needs a MAP_FIXED
mapping to open files from the PKZIP store. The memory mapping mutex was
implemented incorrectly earlier which meant that ftrace and strace could
cause cause crashes. This lock and other recursive mutexes are rewritten
so that it should be provable that recursive mutexes in cosmopolitan are
asynchronous signal safe.
This commit is contained in:
Justine Tunney 2024-06-29 05:10:15 -07:00
parent 6de12c1032
commit 464858dbb4
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GPG key ID: BE714B4575D6E328
34 changed files with 353 additions and 313 deletions
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23
libc/thread/lock.h Normal file
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#ifndef COSMOPOLITAN_LIBC_THREAD_LOCK_H_
#define COSMOPOLITAN_LIBC_THREAD_LOCK_H_
COSMOPOLITAN_C_START_
#define MUTEX_DEPTH_MIN 0x00000010ull
#define MUTEX_DEPTH_MAX 0x000003f0ull
#define MUTEX_TYPE(word) ((word) & 3)
#define MUTEX_PSHARED(word) ((word) & 4)
#define MUTEX_LOCKED(word) ((word) & 8)
#define MUTEX_DEPTH(word) ((word) & MUTEX_DEPTH_MAX)
#define MUTEX_OWNER(word) ((word) >> 32)
#define MUTEX_LOCK(word) (((word) & 7) | 8)
#define MUTEX_UNLOCK(word) ((word) & 7)
#define MUTEX_SET_TYPE(word, type) (((word) & ~3ull) | (type))
#define MUTEX_SET_PSHARED(word, pshared) (((word) & ~4ull) | (pshared))
#define MUTEX_INC_DEPTH(word) ((word) + MUTEX_DEPTH_MIN)
#define MUTEX_DEC_DEPTH(word) ((word) - MUTEX_DEPTH_MIN)
#define MUTEX_SET_OWNER(word, tid) ((uint64_t)(tid) << 32 | (uint32_t)(word))
COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_LIBC_THREAD_LOCK_H_ */