source: libcfa/src/interpose_thread.cfa

//
// Cforall Version 1.0.0 Copyright (C) 2022 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// interpose_thread.c --
//
// Author           : Thierry Delisle
// Created On       : Wed Sep 21 11:55:16 2022
// Last Modified By :
// Last Modified On :
// Update Count     :
//

// BUG in 32-bit gcc with interpose: fixed in >= gcc-9.5, gcc-10.4, gcc-12.2
#ifdef __i386__                                                                                 // 32-bit architecture
#undef _GNU_SOURCE
#endif // __i386__

#include <signal.h>
#include <pthread.h>
#include <signal.h>
extern "C" {
#include <dlfcn.h>                                                                              // dlopen, dlsym
}

#include "bits/defs.hfa"

//=============================================================================================
// Interposing helpers
//=============================================================================================

typedef void (* generic_fptr_t)(void);

generic_fptr_t libcfa_public interpose_symbol(
        generic_fptr_t (*do_interpose_symbol)( void * library, const char symbol[], const char version[] ),
        const char symbol[],
        const char version[]
) {
        void * library;

        #if defined( RTLD_NEXT )
        library = RTLD_NEXT;
        #else
        // missing RTLD_NEXT => must hard-code library name, assuming libstdc++
        library = dlopen( "libpthread.so", RTLD_LAZY );
        if ( ! library ) {                                                                      // == nullptr
                abort( "interpose_symbol : failed to open libpthread, %s\n", dlerror() );
        } // if
        #endif // RTLD_NEXT

        return do_interpose_symbol( library, symbol, version );
}

#define INTERPOSE( x, ver ) __cabi_libpthread.x = (typeof(__cabi_libpthread.x))interpose_symbol( do_interpose_symbol, #x, ver )

//=============================================================================================
// Interposition Startup logic
//=============================================================================================

static struct {
        int (*pthread_create)(pthread_t *_thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg);
        int (*pthread_join)(pthread_t _thread, void **retval);
        pthread_t (*pthread_self)(void);
        int (*pthread_attr_init)(pthread_attr_t *attr);
        int (*pthread_attr_destroy)(pthread_attr_t *attr);
        int (*pthread_attr_setstack)( pthread_attr_t *attr, void *stackaddr, size_t stacksize );
        int (*pthread_attr_getstacksize)( const pthread_attr_t *attr, size_t *stacksize );
        int (*pthread_sigmask)(int how, const sigset_t *set, sigset_t *oldset);
        int (*pthread_sigqueue)(pthread_t _thread, int sig, const union sigval value);
        int (*pthread_once)(pthread_once_t *once_control, void (*init_routine)(void));
} __cabi_libpthread;

extern "C" {
        void __cfathreadabi_interpose_startup( generic_fptr_t (*do_interpose_symbol)( void * library, const char symbol[], const char version[] ) ) libcfa_public {
                const char *version = 0p;

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
                INTERPOSE( pthread_create, version );
                INTERPOSE( pthread_join, version );
                INTERPOSE( pthread_self, version );
                INTERPOSE( pthread_attr_init, version );
                INTERPOSE( pthread_attr_destroy, version );
                INTERPOSE( pthread_attr_setstack, version );
                INTERPOSE( pthread_attr_getstacksize, version );
                INTERPOSE( pthread_sigmask, version );
                INTERPOSE( pthread_sigqueue, version );
                INTERPOSE( pthread_once, version );
#pragma GCC diagnostic pop
        }

        int __cfaabi_pthread_create(pthread_t *_thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg){
                return __cabi_libpthread.pthread_create(_thread, attr, start_routine, arg);
        }

        int __cfaabi_pthread_join(pthread_t _thread, void **retval){
                return __cabi_libpthread.pthread_join(_thread, retval);
        }

        pthread_t __cfaabi_pthread_self(void){
                return __cabi_libpthread.pthread_self();
        }

        int __cfaabi_pthread_attr_init(pthread_attr_t *attr){
                return __cabi_libpthread.pthread_attr_init(attr);
        }

        int __cfaabi_pthread_attr_destroy(pthread_attr_t *attr){
                return __cabi_libpthread.pthread_attr_destroy(attr);
        }

        int __cfaabi_pthread_attr_setstack( pthread_attr_t *attr, void *stackaddr, size_t stacksize ){
                return __cabi_libpthread.pthread_attr_setstack(attr, stackaddr, stacksize);
        }

        int read_pthread_attr_getstacksize( const pthread_attr_t *attr, size_t *stacksize ){
                return __cabi_libpthread.pthread_attr_getstacksize(attr, stacksize);
        }

        int __cfaabi_pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset){
                return __cabi_libpthread.pthread_sigmask(how, set, oldset);
        }

        int __cfaabi_pthread_sigqueue(pthread_t _thread, int sig, const union sigval value) {
                return __cabi_libpthread.pthread_sigqueue(_thread, sig, value);
        }

        int __cfaabi_pthread_once(pthread_once_t *once_control, void (*init_routine)(void)) {
                return __cabi_libpthread.pthread_once(once_control, init_routine);
        }
}