util/system/thread.i


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//do not use directly 
#pragma once
#include "platform.h" 

#if defined(_win_) 
    #include "winint.h"
    #include <process.h> 
 
    typedef HANDLE THREADHANDLE; 
#else 
    #include <pthread.h> 
    #include <sched.h> 
    #include <errno.h> 
    #include <string.h> 
 
    typedef pthread_t THREADHANDLE; 
#endif 
 
#if defined(_freebsd_) 
    #include <pthread_np.h> 
#elif defined(_linux_) 
    #include <sys/prctl.h> 
#endif 
 
#include <util/digest/numeric.h> 

static inline size_t SystemCurrentThreadIdImpl() noexcept {
    #if defined(_unix_) 
        return (size_t)pthread_self(); 
    #elif defined(_win_) 
        return (size_t)GetCurrentThreadId(); 
    #else 
        #error todo 
    #endif 
} 
 
template <class T> 
static inline T ThreadIdHashFunction(T t) noexcept {
    /* 
     * we must permute threadid bits, because some strange platforms(such Linux) 
     * have strange threadid numeric properties 
     *
     * Because they are alligned pointers to pthread_t rather that tid.
     * Currently there is no way to get tid without syscall (slightly slower)
     * (pthread_getthreadid_np is not implemeted in glibc/musl for some reason).
     */ 
    return IntHash(t); 
} 
 
static inline size_t SystemCurrentThreadId() noexcept {
    return ThreadIdHashFunction(SystemCurrentThreadIdImpl()); 
}