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Short circuit the most common pthread_canceled() call for singlethreaded programs
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src/kernel/emulation/linux/bsdthread/bsdthread_create.c
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src/kernel/emulation/linux/bsdthread/bsdthread_create.c
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#define STACK_GUARD_SIZE 4096
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static bool _uses_threads = false;
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// http://www.tldp.org/FAQ/Threads-FAQ/clone.c
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long sys_bsdthread_create(void* thread_start, void* arg,
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#ifndef VARIANT_DYLD // dyld doesn't create threads
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int ret;
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unsigned long stacksize = 0;
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_uses_threads = true;
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#ifndef BSDTHREAD_WRAP_LINUX_PTHREAD
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if (!(flags & PTHREAD_START_CUSTOM))
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}
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#endif
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bool uses_threads(void)
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{
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return _uses_threads;
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}
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src/kernel/emulation/linux/bsdthread/bsdthread_create.h
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src/kernel/emulation/linux/bsdthread/bsdthread_create.h
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#ifndef BSDTHREAD_CREATE_H
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#define BSDTHREAD_CREATE_H
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#include <stdint.h>
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#include <stdbool.h>
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long sys_bsdthread_create(void* thread_start, void* arg, void** stack,
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void* pthread, uint32_t flags);
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uintptr_t arg4, uintptr_t arg5, uintptr_t arg6);
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void* thread_stack_allocate(unsigned long stacksize);
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bool uses_threads(void);
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#define LINUX_CLONE_VM 0x00000100
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#define LINUX_CLONE_FS 0x00000200
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src/kernel/emulation/linux/bsdthread/pthread_canceled.c
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src/kernel/emulation/linux/bsdthread/pthread_canceled.c
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#include <stddef.h>
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#include "../mach/lkm.h"
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#include "../../../../lkm/api.h"
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#include "bsdthread_create.h"
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#include <sys/errno.h>
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long sys_pthread_canceled(int action)
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{
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if (action == 0 && !uses_threads())
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return -EINVAL;
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int ret = lkm_call(NR_pthread_canceled, (void*)(long) action);
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if (ret < 0)
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ret = errno_linux_to_bsd(ret);