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https://github.com/jart/cosmopolitan.git
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a359de7893
This changes *NSYNC to allocate waiters on the stack so our locks don't need to depend on dynamic memory. This make our runtiem simpler, and it also fixes bugs with thread cancellation support.
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_THREAD_TLS_H_
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#define COSMOPOLITAN_LIBC_THREAD_TLS_H_
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#define TLS_ALIGNMENT 64
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#define TIB_FLAG_TIME_CRITICAL 1
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#define TIB_FLAG_VFORKED 2
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#define TIB_FLAG_WINCRASHING 4
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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struct CosmoFtrace { /* 16 */
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bool ft_once; /* 0 */
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bool ft_noreentry; /* 1 */
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int ft_skew; /* 4 */
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int64_t ft_lastaddr; /* 8 */
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};
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struct CosmoTib {
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struct CosmoTib *tib_self; /* 0x00 */
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struct CosmoFtrace tib_ftracer; /* 0x08 */
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void *tib_garbages; /* 0x18 */
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intptr_t tib_locale; /* 0x20 */
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intptr_t tib_pthread; /* 0x28 */
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struct CosmoTib *tib_self2; /* 0x30 */
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_Atomic(int32_t) tib_tid; /* 0x38 transitions -1 → tid → 0 */
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int32_t tib_errno; /* 0x3c */
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uint64_t tib_flags; /* 0x40 */
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long __padding;
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int tib_ftrace; /* inherited */
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int tib_strace; /* inherited */
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uint64_t tib_sigmask; /* inherited */
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void *tib_reserved4;
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void *tib_reserved5;
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void *tib_reserved6;
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void *tib_reserved7;
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void *tib_keys[128];
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};
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extern int __threaded;
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extern unsigned __tls_index;
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#ifdef __x86_64__
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extern bool __tls_enabled;
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#define __tls_enabled_set(x) __tls_enabled = x
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#elif defined(__aarch64__)
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#define __tls_enabled \
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({ \
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register struct CosmoTib *_t asm("x28"); \
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!!_t; \
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})
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#define __tls_enabled_set(x) (void)0
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#else
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#error "unsupported architecture"
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#endif
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void __require_tls(void);
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void __set_tls(struct CosmoTib *);
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#ifdef __x86_64__
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/**
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* Returns location of thread information block.
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*
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* This can't be used in privileged functions.
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*/
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#define __get_tls() \
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({ \
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struct CosmoTib *_t; \
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asm("mov\t%%fs:0,%0" : "=r"(_t) : /* no inputs */ : "memory"); \
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_t; \
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})
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#define __adj_tls(tib) (tib)
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#elif defined(__aarch64__)
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#define __get_tls() \
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({ \
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register struct CosmoTib *_t asm("x28"); \
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_t - 1; \
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})
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#define __adj_tls(tib) ((struct CosmoTib *)(tib) + 1)
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#endif
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_THREAD_TLS_H_ */
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