source: libcfa/src/concurrency/pthread.cfa @ 555af62

//
// Cforall Version 1.0.0 Copyright (C) 2019 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// pthread.cfa --
//
// Author           : Zhenyan Zhu
// Created On       : Sat Aug 6 16:29:18 2022
// Last Modified By : Peter A. Buhr
// Last Modified On : Mon Sep  4 15:37:51 2023
// Update Count     : 1
//

#define __cforall_thread__

#include <signal.h>
#include <pthread.h>
#include <errno.h>
#include "locks.hfa"
#include "bits/stack.hfa"
#include "bits/sequence.hfa"


#define check_nonnull(x) asm("": "+rm"(x)); if( x == 0p ) return EINVAL;

/* pthread key, pthread once inner routine mutual exclusion */
static simple_owner_lock once_lock,key_lock,magic_mutex_check, concurrency_lock;

//######################### Local Storage Helpers #########################

enum { PTHREAD_KEYS_MAX = 1024 };

struct pthread_values{
        inline Seqable;
        void * value;
        bool in_use;
};

static inline {
        pthread_values *& Back( pthread_values * n ) {
                return (pthread_values *)Back( (Seqable *)n );
        }

        pthread_values *& Next( pthread_values * n ) {
                return (pthread_values *)Next( (Colable *)n );
        }
}

struct pthread_keys {
        bool in_use;
        void (* destructor)( void * );
        Sequence(pthread_values) threads;
};

static void ?{}(pthread_keys& k) {
        k.threads{};
}

// Create storage separately to ensure no constructors are called.
static pthread_keys cfa_pthread_keys_storage[PTHREAD_KEYS_MAX] __attribute__((aligned (16)));

static void init_pthread_storage() {
        for ( int i = 0; i < PTHREAD_KEYS_MAX; i++ ) {
                cfa_pthread_keys_storage[i]{};
        }
}

#define cfa_pthread_keys ((pthread_keys *)cfa_pthread_keys_storage)

/* Controlling the iterations of destructors for thread-specific data.  */
#define _POSIX_THREAD_DESTRUCTOR_ITERATIONS     4
/* Number of iterations this implementation does.  */
#define PTHREAD_DESTRUCTOR_ITERATIONS   _POSIX_THREAD_DESTRUCTOR_ITERATIONS

//######################### Parallelism Helpers #########################

struct Pthread_kernel_threads{
        inline Colable;
        processor p;
};

Pthread_kernel_threads *& Next( Pthread_kernel_threads * n ) {
        return (Pthread_kernel_threads *)Next( (Colable *)n );
}

static Stack(Pthread_kernel_threads) cfa_pthreads_kernel_threads;
static bool cfa_pthreads_kernel_threads_zero = false;   // set to zero ?
static int cfa_pthreads_no_kernel_threads = 1;  // number of kernel threads


//######################### Cond Helpers #########################

typedef pthread_cond_var(simple_owner_lock) cfa2pthr_cond_var_t;

/* condvar helper routines */
static void init(pthread_cond_t * pcond) {
        static_assert(sizeof(pthread_cond_t) >= sizeof(cfa2pthr_cond_var_t),"sizeof(pthread_t) < sizeof(cfa2pthr_cond_var_t)");
        cfa2pthr_cond_var_t * _cond = (cfa2pthr_cond_var_t *)pcond;
        ?{}(*_cond);
}

static cfa2pthr_cond_var_t * get(pthread_cond_t * pcond) {
        static_assert(sizeof(pthread_cond_t) >= sizeof(cfa2pthr_cond_var_t),"sizeof(pthread_t) < sizeof(cfa2pthr_cond_var_t)");
        return (cfa2pthr_cond_var_t *)pcond;
}

static void destroy(pthread_cond_t * cond) {
        static_assert(sizeof(pthread_cond_t) >= sizeof(cfa2pthr_cond_var_t),"sizeof(pthread_t) < sizeof(cfa2pthr_cond_var_t)");
        ^?{}(*get(cond));
}


//######################### Mutex Helper #########################

/* mutex helper routines */
static void mutex_check(pthread_mutex_t * t) {
        // Use double check to improve performance.
        // Check is safe on x86; volatile prevents compiler reordering
        volatile pthread_mutex_t * const mutex_ = t;

        // SKULLDUGGERY: not a portable way to access the kind field, /usr/include/x86_64-linux-gnu/bits/pthreadtypes.h
        int _lock_val = ((pthread_mutex_t *)mutex_)->__data.__lock;

        // if pthread_mutex_t is initialized by PTHREAD_MUTEX_INITIALIZER, _lock_val should be 0
        if ( _lock_val == 0 ) {
                lock(magic_mutex_check);
                _lock_val = ((pthread_mutex_t *)mutex_)->__data.__lock;
                if ( _lock_val == 0 ) {
                        pthread_mutex_init( t, NULL );
                }
                unlock(magic_mutex_check);
        }
} // mutex_check


static void init(pthread_mutex_t * plock) {
        static_assert(sizeof(pthread_mutex_t) >= sizeof(simple_owner_lock),"sizeof(pthread_mutex_t) < sizeof(simple_owner_lock)");
        simple_owner_lock * _lock = (simple_owner_lock *)plock;
        ?{}(*_lock);
}

static simple_owner_lock * get(pthread_mutex_t * plock) {
        static_assert(sizeof(pthread_mutex_t) >= sizeof(simple_owner_lock),"sizeof(pthread_mutex_t) < sizeof(simple_owner_lock)");
        return (simple_owner_lock *)plock;
}

static void destroy(pthread_mutex_t * plock) {
        static_assert(sizeof(pthread_mutex_t) >= sizeof(simple_owner_lock),"sizeof(pthread_mutex_t) < sizeof(simple_owner_lock)");
        ^?{}(*get(plock));
}

//######################### Attr helpers #########################
typedef struct cfaPthread_attr_t {                                              // thread attributes
                int contentionscope;
                int detachstate;
                size_t stacksize;
                void * stackaddr;
                int policy;
                int inheritsched;
                struct sched_param param;
} cfaPthread_attr_t;

static const cfaPthread_attr_t default_attrs {
        0,
        0,
        65_000,
        NULL,
        0,
        0,
        {0}
};

static cfaPthread_attr_t * get(const pthread_attr_t * attr) {
        static_assert(sizeof(pthread_attr_t) >= sizeof(cfaPthread_attr_t), "sizeof(pthread_attr_t) < sizeof(cfaPthread_attr_t)");
        return (cfaPthread_attr_t *)attr;
}


//######################### Threads Helper #########################

// exception for cancel_stack in pthread_exit
exception pthread_exit_exp {};
static vtable(pthread_exit_exp) exp_vt;

thread cfaPthread{
        cfaPthread_attr_t attr;
        pthread_t pthreadId;

        // pthreads return value
        void * joinval;

        // pthread attributes
        pthread_attr_t pthread_attr;

        void *(* start_routine)(void *);
        void * start_arg;

        // thread local data
        pthread_values * pthreadData;

        // flag used for tryjoin
        bool isTerminated;
};

/* thread part routines */
//  cfaPthread entry point
void main(cfaPthread & _thread) with(_thread) {
        joinval = start_routine(start_arg);
        isTerminated = true;
}

static cfaPthread * lookup( pthread_t p ) {
        static_assert(sizeof(pthread_t) >= sizeof(cfaPthread *),"sizeof(pthread_t) < sizeof(cfaPthread *)");
        return (cfaPthread *)p;
}

static void pthread_deletespecific_( pthread_values * values )  { // see uMachContext::invokeTask
        pthread_values * value;
        pthread_keys * key;
        bool destcalled = true;
        if (values != NULL) {
                for ( int attempts = 0; attempts < PTHREAD_DESTRUCTOR_ITERATIONS && destcalled ; attempts += 1 ) {
                        destcalled = false;
                        lock(key_lock);
                        for ( int i = 0; i < PTHREAD_KEYS_MAX; i++ ) {
                                // for each valid key
                                if ( values[i].in_use) {
                                        value = &values[i];
                                        key = &cfa_pthread_keys[i];
                                        value->in_use = false;
                                        remove(key->threads, *value);
                                        // if  a  key  value  has  a  non-NULL  destructor pointer,  and  the  thread  has  a  non-NULL  value associated with that key,
                                        // the value of the key is set to NULL, and then the function pointed to is called with the previously associated value as its sole argument.
                                        if (value->value != NULL && key->destructor != NULL) {
                                                unlock(key_lock);
                                                key->destructor(value->value); // run destructor
                                                lock(key_lock);
                                                destcalled = true;
                                        }   // if
                                        value->value = NULL;
                                }   // if
                        }   // for
                        unlock(key_lock);
                }   // for
                free(values);
        }   // if
}

static void ^?{}(cfaPthread & mutex t) {
        // delete pthread local storage
        pthread_values * values = t.pthreadData;
        pthread_deletespecific_(values);
}

static void ?{}(cfaPthread & t, pthread_t * _thread, const pthread_attr_t * _attr,void *(* start_routine)(void *), void * arg) {
        static_assert(sizeof(pthread_t) >= sizeof(cfaPthread *), "pthread_t too small to hold a pointer: sizeof(pthread_t) < sizeof(cfaPthread *)");

        // set up user thread stackSize
        cfaPthread_attr_t * attr = get(_attr);
        ((thread&)t){ attr ? attr->stacksize: DEFAULT_STACK_SIZE };

        // initialize _thread & cfaPthread id
        *_thread = t.pthreadId = (pthread_t)(&t);

        // if attr null, self attr will be set as default_attrs; else set to attr
        t.attr = (attr != NULL ? *attr : default_attrs);

        // init start routine and arguments
        t.start_routine = start_routine;
        t.start_arg = arg;
        t.pthreadData = NULL;
}


extern "C"{
        //######################### Pthread Attrs #########################

        int pthread_attr_init(pthread_attr_t * attr) libcfa_public __THROW {
                cfaPthread_attr_t * _attr = get(attr);
                ?{}(*_attr, default_attrs);
                return 0;
        }
        int pthread_attr_destroy(pthread_attr_t * attr) libcfa_public __THROW {
                ^?{}(*get(attr));
                return 0;
        }

        int pthread_attr_setscope( pthread_attr_t * attr, int contentionscope ) libcfa_public __THROW {
                get( attr )->contentionscope = contentionscope;
                return 0;
        } // pthread_attr_setscope

        int pthread_attr_getscope( const pthread_attr_t * attr, int * contentionscope ) libcfa_public __THROW {
                *contentionscope = get( attr )->contentionscope;
                return 0;
        } // pthread_attr_getscope

        int pthread_attr_setdetachstate( pthread_attr_t * attr, int detachstate ) libcfa_public __THROW {
                get( attr )->detachstate = detachstate;
                return 0;
        } // pthread_attr_setdetachstate

        int pthread_attr_getdetachstate( const pthread_attr_t * attr, int * detachstate ) libcfa_public __THROW {
                *detachstate = get( attr )->detachstate;
                return 0;
        } // pthread_attr_getdetachstate

        int pthread_attr_setstacksize( pthread_attr_t * attr, size_t stacksize ) libcfa_public __THROW {
                get( attr )->stacksize = stacksize;
                return 0;
        } // pthread_attr_setstacksize

        int pthread_attr_getstacksize( const pthread_attr_t * attr, size_t * stacksize ) libcfa_public __THROW {
                *stacksize = get( attr )->stacksize;
                return 0;
        } // pthread_attr_getstacksize

        int pthread_attr_getguardsize( const pthread_attr_t * /* attr */, size_t * /* guardsize */ ) libcfa_public __THROW {
                return 0;
        } // pthread_attr_getguardsize

        int pthread_attr_setguardsize( pthread_attr_t * /* attr */, size_t /* guardsize */ ) libcfa_public __THROW {
                return 0;
        } // pthread_attr_setguardsize

        int pthread_attr_setstackaddr( pthread_attr_t * attr, void * stackaddr ) libcfa_public __THROW {
                get( attr )->stackaddr = stackaddr;
                return 0;
        } // pthread_attr_setstackaddr

        int pthread_attr_getstackaddr( const pthread_attr_t * attr, void ** stackaddr ) libcfa_public __THROW {
                *stackaddr = get( attr )->stackaddr;
                return 0;
        } // pthread_attr_getstackaddr

        int pthread_attr_setstack( pthread_attr_t * attr, void * stackaddr, size_t stacksize ) libcfa_public __THROW {
                get( attr )->stackaddr = stackaddr;
                get( attr )->stacksize = stacksize;
                return 0;
        } // pthread_attr_setstack

        int pthread_attr_getstack( const pthread_attr_t * attr, void ** stackaddr, size_t * stacksize ) libcfa_public __THROW {
                *stackaddr = get( attr )->stackaddr;
                *stacksize = get( attr )->stacksize;
                return 0;
        } // pthread_attr_getstack

        // Initialize thread attribute *attr with attributes corresponding to the
        // already running thread threadID. It shall be called on unitialized attr
        // and destroyed with pthread_attr_destroy when no longer needed.
        int pthread_getattr_np( pthread_t threadID, pthread_attr_t * attr ) libcfa_public __THROW { // GNU extension
                check_nonnull(attr);

                // copy all fields
                *get(attr) = lookup( threadID )->attr;

                return 0;
        } // pthread_getattr_np


        //######################### Threads #########################

        int pthread_create(pthread_t * _thread, const pthread_attr_t * attr, void *(* start_routine)(void *), void * arg) libcfa_public __THROW {
                cfaPthread * t = alloc();
                (*t){_thread, attr, start_routine, arg};
                return 0;
        }

        int pthread_join(pthread_t _thread, void ** value_ptr) libcfa_public __THROW {
                // if thread is invalid
                if (_thread == NULL) return EINVAL;
                if (_thread == pthread_self()) return EDEADLK;

                // get user thr pointer
                cfaPthread * p = lookup(_thread);
                try {
                        join(*p);
                }
                // if thread called pthread_exit
                catchResume (ThreadCancelled(cfaPthread) * cancel) {}

                // fetch result
                if (value_ptr != NULL ) *value_ptr = p->joinval;
                delete(p);
                return 0;
        }

        int pthread_tryjoin_np(pthread_t _thread, void ** value_ptr) libcfa_public __THROW {
                // if thread is invalid
                if (_thread == NULL) return EINVAL;
                if (_thread == pthread_self()) return EDEADLK;

                cfaPthread * p = lookup(_thread);

                // thread not finished ?
                if (!p->isTerminated) return EBUSY;

                join( *p );

                if (value_ptr != NULL ) *value_ptr = p->joinval;
                delete(p);
                return 0;
        }

        pthread_t pthread_self(void) libcfa_public __THROW {
                return (pthread_t)((uintptr_t)active_thread() - (sizeof(cfaPthread) - sizeof(thread$)));
        }

        void pthread_exit(void * status) libcfa_public __THROW {
                pthread_t pid = pthread_self();
                cfaPthread * _thread = (cfaPthread *)pid;
                _thread->joinval = status;  // set return value
                _thread->isTerminated = 1;  // set terminated flag
                cancel_stack((pthread_exit_exp){&exp_vt});
        }   //pthread_exit_

        int pthread_yield( void ) __THROW {                     // GNU extension
                yield();
                return 0;
        }


        //######################### Mutex #########################

        int pthread_mutex_init(pthread_mutex_t *_mutex, const pthread_mutexattr_t * attr) libcfa_public __THROW {
                check_nonnull(_mutex);
                init(_mutex);
                return 0;
        }   //pthread_mutex_init_


        int pthread_mutex_destroy(pthread_mutex_t *_mutex) libcfa_public __THROW {
                check_nonnull(_mutex);
                simple_owner_lock * _lock = get(_mutex);
                if (_lock->owner != NULL) {
                        return EBUSY;
                }
                destroy(_mutex);
                return 0;
        }   //pthread_mutex_destroy_

        int pthread_mutex_lock(pthread_mutex_t *_mutex) libcfa_public __THROW {
                check_nonnull(_mutex);
                mutex_check(_mutex);
                simple_owner_lock * _lock = get(_mutex);
                lock(*_lock);
                return 0;
        }   //pthread_mutex_lock_

        int pthread_mutex_unlock(pthread_mutex_t *_mutex) libcfa_public __THROW {
                check_nonnull(_mutex);
                simple_owner_lock * _lock = get(_mutex);
                if (_lock->owner != active_thread()) {
                        return EPERM;
                } // current thread does not hold the mutex
                unlock(*_lock);
                return 0;
        }   //pthread_mutex_unlock_

        int pthread_mutex_trylock(pthread_mutex_t *_mutex) libcfa_public __THROW {
                check_nonnull(_mutex);
                simple_owner_lock * _lock = get(_mutex);
                if (_lock->owner != active_thread() && _lock->owner != NULL) {
                        return EBUSY;
                }   // if mutex is owned
                lock(*_lock);
                return 0;
        }   //pthread_mutex_trylock_

        //######################### Conditional Variable #########################

        /* conditional variable routines */
        int pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * attr) libcfa_public __THROW {
                check_nonnull(cond);
                init(cond);
                return 0;
        }  //pthread_cond_init

        int pthread_cond_wait(pthread_cond_t * cond, pthread_mutex_t *_mutex) libcfa_public __THROW {
                check_nonnull(_mutex);
                check_nonnull(cond);
                wait(*get(cond), *get(_mutex));
                return 0;
        } // pthread_cond_wait

        int pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * _mutex, const struct timespec * abstime) libcfa_public __THROW {
                check_nonnull(_mutex);
                check_nonnull(cond);
                wait(*get(cond), *get(_mutex), *abstime);
                return 0;
        } // pthread_cond_timedwait

        int pthread_cond_signal(pthread_cond_t * cond) libcfa_public __THROW {
                check_nonnull(cond);
                return notify_one(*get(cond));
        } // pthread_cond_signal

        int pthread_cond_broadcast(pthread_cond_t * cond) libcfa_public __THROW {
                check_nonnull(cond);
                return notify_all(*get(cond));
        } // pthread_cond_broadcast

        int pthread_cond_destroy(pthread_cond_t * cond) libcfa_public __THROW {
                check_nonnull(cond);
                destroy(cond);
                return 0;
        } // pthread_cond_destroy



        //######################### Local storage #########################

        int pthread_once(pthread_once_t * once_control, void (* init_routine)(void)) libcfa_public __THROW {
                static_assert(sizeof(pthread_once_t) >= sizeof(int),"sizeof(pthread_once_t) < sizeof(int)");
                check_nonnull(once_control);
                check_nonnull(init_routine);
                lock(once_lock);
                if ( *((int *)once_control) == 0 ) {
                        init_routine();
                        *((int *)once_control) = 1;
                } // if
                unlock(once_lock);
                return 0;
        } // pthread_once

        int pthread_key_create( pthread_key_t * key, void (* destructor)( void * ) ) libcfa_public __THROW {
                lock(key_lock);
                for ( int i = 0; i < PTHREAD_KEYS_MAX; i += 1 ) {
                        if ( ! cfa_pthread_keys[i].in_use ) {
                                cfa_pthread_keys[i].in_use = true;
                                cfa_pthread_keys[i].destructor = destructor;
                                unlock( key_lock );
                                *key = i;
                                return 0;
                        } // if
                } // for
                unlock(key_lock);
                return EAGAIN;
        }   // pthread_key_create

        int pthread_key_delete( pthread_key_t key ) libcfa_public __THROW {
                lock(key_lock);
                if ( key >= PTHREAD_KEYS_MAX || ! cfa_pthread_keys[key].in_use ) {
                        unlock( key_lock );
                        return EINVAL;
                } // if
                cfa_pthread_keys[key].in_use = false;
                cfa_pthread_keys[key].destructor = NULL;

                // Remove key from all threads with a value.
                pthread_values& p;
                Sequence(pthread_values)& head = cfa_pthread_keys[key].threads;
                for ( SeqIter(pthread_values) iter = { head }; iter | p; ) {
                        remove(head, p);
                        p.in_use = false;
                }
                unlock(key_lock);
                return 0;
        }   // pthread_key_delete

        int pthread_setspecific( pthread_key_t key, const void * value ) libcfa_public __THROW {
                // get current thread
                cfaPthread * t = lookup(pthread_self());
                // if current thread's pthreadData is NULL; initialize it
                pthread_values * values;
                if (t->pthreadData == NULL) {
                        values = anew( PTHREAD_KEYS_MAX);
                        t->pthreadData = values;
                        for ( int i = 0;i < PTHREAD_KEYS_MAX; i++ ) {
                                t->pthreadData[i].in_use = false;
                        }   // for
                }   else {
                        values = t->pthreadData;
                }   // if
                // find corresponding key and set value
                lock(key_lock);
                // if invalid key
                if ( key >= PTHREAD_KEYS_MAX || ! cfa_pthread_keys[key].in_use ) {
                        unlock( key_lock );
                        return EINVAL;
                } // if
                pthread_values &entry = values[key];
                if ( ! entry.in_use ) {
                        entry.in_use = true;
                        add(cfa_pthread_keys[key].threads, entry);
                } // if
                entry.value = (void *)value;
                unlock(key_lock);
                return 0;
        } //pthread_setspecific

        void * pthread_getspecific(pthread_key_t key) libcfa_public __THROW {
                if (key >= PTHREAD_KEYS_MAX || ! cfa_pthread_keys[key].in_use) return NULL;

                // get current thread
                cfaPthread * t = lookup(pthread_self());
                if (t->pthreadData == NULL) return NULL;
                lock(key_lock);
                pthread_values & entry = ((pthread_values *)t->pthreadData)[key];
                if ( ! entry.in_use ) {
                        unlock( key_lock );
                        return NULL;
                } // if
                void * value = entry.value;
                unlock(key_lock);

                return value;
        }   //pthread_get_specific

        //######################### Parallelism #########################
        void pthread_delete_kernel_threads_() __THROW { // see uMain::~uMain
                Pthread_kernel_threads& p;
                for ( StackIter(Pthread_kernel_threads) iter = {cfa_pthreads_kernel_threads}; iter | p; ) {
                        delete(&p);
                } // for
        } // pthread_delete_kernel_threads_

        int pthread_getconcurrency( void ) __THROW {    // XOPEN extension
                return cfa_pthreads_kernel_threads_zero ? 0 : cfa_pthreads_no_kernel_threads;
        } // pthread_getconcurrency

        int pthread_setconcurrency( int new_level ) libcfa_public __THROW { // XOPEN extension
                if ( new_level < 0 ) return EINVAL;
                if ( new_level == 0 ) {
                        cfa_pthreads_kernel_threads_zero = true;        // remember set to zero, but ignore
                        return 0;                                       // do not do kernel thread management
                } // exit
                cfa_pthreads_kernel_threads_zero = false;
                lock( concurrency_lock );
                for ( ; new_level > cfa_pthreads_no_kernel_threads; cfa_pthreads_no_kernel_threads += 1 ) { // add processors ?
                        push(cfa_pthreads_kernel_threads, *new() );
                } // for
                for ( ; new_level < cfa_pthreads_no_kernel_threads; cfa_pthreads_no_kernel_threads -= 1 ) { // remove processors ?
                        delete(&pop(cfa_pthreads_kernel_threads));
                } // for
                unlock( concurrency_lock );
                return 0;
        } // pthread_setconcurrency

        //######################### Signal #########################


         int pthread_sigmask( int /* how */, const sigset_t * /* set */, sigset_t * /* oset */ ) libcfa_public __THROW {
                abort( "pthread_sigmask : not implemented" );
                return 0;
         } // pthread_sigmask

        int pthread_kill( pthread_t _thread __attribute__(( unused )), int sig ) libcfa_public __THROW {
                if ( sig == 0 ) {
                        return 0;
                } else {
                        abort( "pthread_kill : not implemented" );
                } // if
                return 0;
        } // pthread_kill

        int pthread_sigqueue(pthread_t , int sig, const union sigval) libcfa_public __THROW {
                abort( "pthread_sigqueue : not implemented" );
                return 0;
        } // pthread_sigqueue

        //######################### Scheduling #########################
        int pthread_detach( pthread_t threadID ) __THROW {
                abort( "pthread_detach : not implemented" );
                return 0;
        } // pthread_detach

        int pthread_setschedparam( pthread_t /* thread */, int /* policy */, const struct sched_param * /* param */ ) libcfa_public __THROW {
                abort( "pthread_setschedparam : not implemented" );
                return 0;
        } // pthread_setschedparam

        int pthread_getschedparam( pthread_t /* thread */, int */* policy */, struct sched_param * /* param */ ) libcfa_public __THROW {
                abort( "pthread_getschedparam : not implemented" );
                return 0;
        } // pthread_getschedparam

         //######################### Mutex Attr #########################

        int pthread_mutexattr_init( pthread_mutexattr_t * /* attr */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_init

        int pthread_mutexattr_destroy( pthread_mutexattr_t * /* attr */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_destroy

        int pthread_mutexattr_setpshared( pthread_mutexattr_t * /* attr */, int /* pshared */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_setpshared

        int pthread_mutexattr_getpshared( const pthread_mutexattr_t * /* attr */, int * /* pshared */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_getpshared

        int pthread_mutexattr_setprotocol( pthread_mutexattr_t * /* attr */, int /* protocol */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_setprotocol

        int pthread_mutexattr_getprotocol( const pthread_mutexattr_t * /* attr */, int * /* protocol */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_getprotocol

        int pthread_mutexattr_setprioceiling( pthread_mutexattr_t * /* attr */, int /* prioceiling */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_setprioceiling

        int pthread_mutexattr_getprioceiling( const pthread_mutexattr_t * /* attr */, int * /* ceiling */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_getprioceiling

        int pthread_mutex_setprioceiling( pthread_mutex_t * /* mutex */, int /* prioceiling */, int * /* old_ceiling */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutex_setprioceiling

        int pthread_mutex_getprioceiling( const pthread_mutex_t * /* mutex */, int * /* ceiling */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutex_getprioceiling

        int pthread_mutexattr_gettype( __const pthread_mutexattr_t * __restrict /* __attr */, int * __restrict /* __kind */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_gettype

        int pthread_mutexattr_settype( pthread_mutexattr_t * /* __attr */, int /* __kind */ ) libcfa_public __THROW {
                return 0;
        } // pthread_mutexattr_settype

        //######################### Mutex #########################

        int pthread_mutex_timedlock( pthread_mutex_t *__restrict /* __mutex */, __const struct timespec *__restrict /* __abstime */ ) libcfa_public __THROW {
                abort( "pthread_mutex_timedlock" );
        } // pthread_mutex_timedlock

        //######################### Condition #########################

        int pthread_condattr_getclock( __const pthread_condattr_t * __restrict /* __attr */, __clockid_t *__restrict /* __clock_id */ ) libcfa_public __THROW {
                abort( "pthread_condattr_getclock" );
        } // pthread_condattr_getclock

        int pthread_condattr_setclock( pthread_condattr_t * /* __attr */, __clockid_t /* __clock_id */ ) libcfa_public __THROW {
                abort( "pthread_condattr_setclock" );
        } // pthread_condattr_setclock

        //######################### Spinlock #########################

        int pthread_spin_init( pthread_spinlock_t * /* __lock */, int /*__pshared */ ) libcfa_public __THROW {
                abort( "pthread_spin_init" );
        } // pthread_spin_init

        int pthread_spin_destroy( pthread_spinlock_t * /* __lock */ ) libcfa_public __THROW {
                abort( "pthread_spin_destroy" );
        } // pthread_spin_destroy

        int pthread_spin_lock( pthread_spinlock_t * /* __lock */ ) libcfa_public __THROW {
                abort( "pthread_spin_lock" );
        } // pthread_spin_lock

        int pthread_spin_trylock( pthread_spinlock_t * /* __lock */ ) libcfa_public __THROW {
                abort( "pthread_spin_trylock" );
        } // pthread_spin_trylock

        int pthread_spin_unlock( pthread_spinlock_t * /* __lock */ ) libcfa_public __THROW {
                abort( "pthread_spin_unlock" );
        } // pthread_spin_unlock

        //######################### Barrier #########################

        int pthread_barrier_init( pthread_barrier_t *__restrict /* __barrier */, __const pthread_barrierattr_t *__restrict /* __attr */, unsigned int /* __count */ ) libcfa_public __THROW {
                abort( "pthread_barrier_init" );
        } // pthread_barrier_init

        int pthread_barrier_destroy( pthread_barrier_t * /* __barrier */ ) libcfa_public  __THROW {
                abort( "pthread_barrier_destroy" );
        } // pthread_barrier_destroy

        int pthread_barrier_wait( pthread_barrier_t * /* __barrier */ ) libcfa_public __THROW {
                abort( "pthread_barrier_wait" );
        } // pthread_barrier_wait

        int pthread_barrierattr_init( pthread_barrierattr_t * /* __attr */ ) libcfa_public __THROW {
                abort( "pthread_barrierattr_init" );
        } // pthread_barrierattr_init

        int pthread_barrierattr_destroy( pthread_barrierattr_t * /* __attr */ ) libcfa_public __THROW {
                abort( "pthread_barrierattr_destroy" );
        } // pthread_barrierattr_destroy

        int pthread_barrierattr_getpshared( __const pthread_barrierattr_t * __restrict /* __attr */, int *__restrict /* __pshared */ ) libcfa_public __THROW {
                abort( "pthread_barrierattr_getpshared" );
        } // pthread_barrierattr_getpshared

        int pthread_barrierattr_setpshared( pthread_barrierattr_t * /* __attr */, int /* __pshared */ ) libcfa_public __THROW {
                abort( "pthread_barrierattr_setpshared" );
        } // pthread_barrierattr_setpshared

        //######################### Clock #########################

        int pthread_getcpuclockid( pthread_t /* __thread_id */, __clockid_t * /* __clock_id */ ) libcfa_public __THROW {
                abort( "pthread_getcpuclockid" );
        } // pthread_getcpuclockid

        // pthread_atfork()

// UNIX98

        //######################### Read/Write #########################

        int pthread_rwlock_init( pthread_rwlock_t *__restrict /* __rwlock */, __const pthread_rwlockattr_t *__restrict /* __attr */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_init" );
        } // pthread_rwlock_init

        int pthread_rwlock_destroy( pthread_rwlock_t * /* __rwlock */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_destroy" );
        } // pthread_rwlock_destroy

        int pthread_rwlock_rdlock( pthread_rwlock_t * /* __rwlock */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_rdlock" );
        } // pthread_rwlock_rdlock

        int pthread_rwlock_tryrdlock( pthread_rwlock_t * /* __rwlock */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_tryrdlock" );
        } // pthread_rwlock_tryrdlock

        int pthread_rwlock_wrlock( pthread_rwlock_t * /* __rwlock */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_wrlock" );
        } // pthread_rwlock_wrlock

        int pthread_rwlock_trywrlock( pthread_rwlock_t * /* __rwlock */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_trywrlock" );
        } // pthread_rwlock_trywrlock

        int pthread_rwlock_unlock( pthread_rwlock_t * /* __rwlock */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_unlock" );
        } // pthread_rwlock_unlock

        int pthread_rwlockattr_init( pthread_rwlockattr_t * /* __attr */ ) libcfa_public __THROW {
                abort( "pthread_rwlockattr_init" );
        } // pthread_rwlockattr_init

        int pthread_rwlockattr_destroy( pthread_rwlockattr_t * /*__attr */ ) libcfa_public __THROW {
                abort( "pthread_rwlockattr_destroy" );
        } // pthread_rwlockattr_destroy

        int pthread_rwlockattr_getpshared( __const pthread_rwlockattr_t * __restrict /* __attr */, int *__restrict /* __pshared */ ) libcfa_public __THROW {
                abort( "pthread_rwlockattr_getpshared" );
        } // pthread_rwlockattr_getpshared

        int pthread_rwlockattr_setpshared( pthread_rwlockattr_t * /* __attr */, int /* __pshared */ ) libcfa_public __THROW {
                abort( "pthread_rwlockattr_setpshared" );
        } // pthread_rwlockattr_setpshared

        int pthread_rwlockattr_getkind_np( __const pthread_rwlockattr_t * /* __attr */, int * /* __pref */ ) libcfa_public __THROW {
                abort( "pthread_rwlockattr_getkind_np" );
        } // pthread_rwlockattr_getkind_np

        int pthread_rwlockattr_setkind_np( pthread_rwlockattr_t * /* __attr */, int /* __pref */ ) libcfa_public __THROW {
                abort( "pthread_rwlockattr_setkind_np" );
        } // pthread_rwlockattr_setkind_np

// UNIX98 + XOPEN

        int pthread_rwlock_timedrdlock( pthread_rwlock_t *__restrict  /* __rwlock */, __const struct timespec *__restrict /* __abstime */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_timedrdlock" );
        } // pthread_rwlock_timedrdlock

        int pthread_rwlock_timedwrlock( pthread_rwlock_t *__restrict  /* __rwlock */, __const struct timespec *__restrict /* __abstime */ ) libcfa_public __THROW {
                abort( "pthread_rwlock_timedwrlock" );
        } // pthread_rwlock_timedwrlock

// GNU

        //######################### Parallelism #########################

        // int pthread_setaffinity_np( pthread_t /* __th */, size_t /* __cpusetsize */, __const cpu_set_t * /* __cpuset */ ) libcfa_public __THROW {
        //      abort( "pthread_setaffinity_np" );
        // } // pthread_setaffinity_np

        // int pthread_getaffinity_np( pthread_t /* __th */, size_t /* __cpusetsize */, cpu_set_t * /* __cpuset */ ) libcfa_public __THROW {
        //      abort( "pthread_getaffinity_np" );
        // } // pthread_getaffinity_np

        // int pthread_attr_setaffinity_np( pthread_attr_t * /* __attr */, size_t /* __cpusetsize */, __const cpu_set_t * /* __cpuset */ ) libcfa_public __THROW {
        //      abort( "pthread_attr_setaffinity_np" );
        // } // pthread_attr_setaffinity_np

        // int pthread_attr_getaffinity_np( __const pthread_attr_t * /* __attr */, size_t /* __cpusetsize */, cpu_set_t * /* __cpuset */ ) libcfa_public __THROW {
        //      abort( "pthread_attr_getaffinity_np" );
        // } // pthread_attr_getaffinity_np

        //######################### Cancellation #########################

        void _pthread_cleanup_push_defer( struct _pthread_cleanup_buffer * /* __buffer */, void( * /* __routine */ )( void * ), void * /* __arg */ ) libcfa_public __THROW {
                abort( "_pthread_cleanup_push_defer" );
        } // _pthread_cleanup_push_defer

        void _pthread_cleanup_pop_restore( struct _pthread_cleanup_buffer * /* __buffer */, int /* __execute */ ) libcfa_public __THROW {
                abort( "_pthread_cleanup_pop_restore" );
        } // _pthread_cleanup_pop_res

        int pthread_cancel( pthread_t threadID ) libcfa_public __THROW {
                abort("pthread cancel not implemented");
                return 0;
        } // pthread_cancel

        int pthread_setcancelstate( int state, int * oldstate ) libcfa_public __THROW {
                abort("pthread_setcancelstate not implemented");
                return 0;
        } // pthread_setcancelstate

        int pthread_setcanceltype( int type, int * oldtype ) libcfa_public __THROW {
                abort("pthread_setcanceltype not implemented");
                return 0;
        } // pthread_setcanceltype
} // extern "C"

#pragma GCC diagnostic pop