ecl/src/c/threads/process.d

/* -*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*- */
/* vim: set filetype=c tabstop=8 shiftwidth=4 expandtab: */

/*
    threads.d -- Native threads.
*/
/*
    Copyright (c) 2003, Juan Jose Garcia Ripoll.

    ECL is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    See file '../Copyright' for full details.
*/

#ifndef __sun__ /* See unixinit.d for this */
#define _XOPEN_SOURCE 600       /* For pthread mutex attributes */
#endif
#include <errno.h>
#include <time.h>
#include <signal.h>
#define ECL_INCLUDE_MATH_H
#include <ecl/ecl.h>
#ifdef ECL_WINDOWS_THREADS
# include <windows.h>
#else
# include <pthread.h>
#endif
#ifdef HAVE_GETTIMEOFDAY
# include <sys/time.h>
#endif
#include <ecl/internal.h>
#include <ecl/ecl-inl.h>
#include "threads/ecl_atomics.h"

#ifdef ECL_WINDOWS_THREADS
/*
 * We have to put this explicit definition here because Boehm GC
 * is designed to produce a DLL and we rather want a static
 * reference
 */
# include <gc.h>
extern HANDLE WINAPI GC_CreateThread(
    LPSECURITY_ATTRIBUTES lpThreadAttributes, 
    DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress, 
    LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId );
# ifndef WITH___THREAD
DWORD cl_env_key;
# endif
#else
# ifndef WITH___THREAD
static pthread_key_t cl_env_key;
# endif
#endif /* ECL_WINDOWS_THREADS */

extern void ecl_init_env(struct cl_env_struct *env);

#if !defined(WITH___THREAD)
cl_env_ptr
ecl_process_env(void)
{
#ifdef ECL_WINDOWS_THREADS
        return TlsGetValue(cl_env_key);
#else
        struct cl_env_struct *rv = pthread_getspecific(cl_env_key);
        if (rv)
                return rv;
        FElibc_error("pthread_getspecific() failed.", 0);
        return NULL;
#endif
}
#endif

static void
ecl_set_process_env(cl_env_ptr env)
{
#ifdef WITH___THREAD
        cl_env_p = env;
#else
# ifdef ECL_WINDOWS_THREADS
        TlsSetValue(cl_env_key, env);
# else
        if (pthread_setspecific(cl_env_key, env))
                FElibc_error("pthread_setspecific() failed.", 0);
# endif
#endif
}

cl_object
mp_current_process(void)
{
        return ecl_process_env()->own_process;
}

/*----------------------------------------------------------------------
 * PROCESS LIST
 */

static void
extend_process_vector()
{
        cl_object v = cl_core.processes;
        cl_index new_size = v->vector.dim + v->vector.dim/2;
        cl_env_ptr the_env = ecl_process_env();
        ECL_WITH_SPINLOCK_BEGIN(the_env, &cl_core.processes_spinlock) {
                cl_object other = cl_core.processes;
                if (new_size > other->vector.dim) {
                        cl_object new = si_make_vector(ECL_T,
                                                       ecl_make_fixnum(new_size),
                                                       ecl_make_fixnum(other->vector.fillp),
                                                       ECL_NIL, ECL_NIL, ECL_NIL);
                        ecl_copy_subarray(new, 0, other, 0, other->vector.dim);
                        cl_core.processes = new;
                }
        } ECL_WITH_SPINLOCK_END;
}

static void
ecl_list_process(cl_object process)
{
        cl_env_ptr the_env = ecl_process_env();
        bool ok = 0;
        do {
                ECL_WITH_SPINLOCK_BEGIN(the_env, &cl_core.processes_spinlock) {
                        cl_object vector = cl_core.processes;
                        cl_index size = vector->vector.dim;
                        cl_index ndx = vector->vector.fillp;
                        if (ndx < size) {
                                vector->vector.self.t[ndx++] = process;
                                vector->vector.fillp = ndx;
                                ok = 1;
                        }
                } ECL_WITH_SPINLOCK_END;
                if (ok) break;
                extend_process_vector();
        } while (1);
}

static void
ecl_unlist_process(cl_object process)
{
        cl_env_ptr the_env = ecl_process_env();
        ECL_WITH_SPINLOCK_BEGIN(the_env, &cl_core.processes_spinlock) {
                cl_object vector = cl_core.processes;
                cl_index i;
                for (i = 0; i < vector->vector.fillp; i++) {
                        if (vector->vector.self.t[i] == process) {
                                vector->vector.fillp--;
                                do {
                                        vector->vector.self.t[i] =
                                                vector->vector.self.t[i+1];
                                } while (++i < vector->vector.fillp);
                                break;
                        }
                }
        } ECL_WITH_SPINLOCK_END;
}

static cl_object
ecl_process_list()
{
        cl_env_ptr the_env = ecl_process_env();
        cl_object output = ECL_NIL;
        ECL_WITH_SPINLOCK_BEGIN(the_env, &cl_core.processes_spinlock) {
                cl_object vector = cl_core.processes;
                cl_object *data = vector->vector.self.t;
                cl_index i;
                for (i = 0; i < vector->vector.fillp; i++) {
                        cl_object p = data[i];
                        if (p != ECL_NIL)
                                output = ecl_cons(p, output);
                }
        } ECL_WITH_SPINLOCK_END;
        return output;
}

/*----------------------------------------------------------------------
 * THREAD OBJECT
 */

static void
assert_type_process(cl_object o)
{
        if (ecl_t_of(o) != t_process)
                FEwrong_type_argument(@[mp::process], o);
}

static void
thread_cleanup(void *aux)
{
        /* This routine performs some cleanup before a thread is completely
         * killed. For instance, it has to remove the associated process
         * object from the list, an it has to dealloc some memory.
         *
         * NOTE: thread_cleanup() does not provide enough "protection". In
         * order to ensure that all UNWIND-PROTECT forms are properly
         * executed, never use pthread_cancel() to kill a process, but
         * rather use the lisp functions mp_interrupt_process() and
         * mp_process_kill().
         */
        cl_object process = (cl_object)aux;
        cl_env_ptr env = process->process.env;
        /* The following flags will disable all interrupts. */
        AO_store_full((AO_t*)&process->process.phase, ECL_PROCESS_EXITING);
        ecl_disable_interrupts_env(env);
#ifdef HAVE_SIGPROCMASK
        /* ...but we might get stray signals. */
        {
                sigset_t new[1];
                sigemptyset(new);
                sigaddset(new, ecl_option_values[ECL_OPT_THREAD_INTERRUPT_SIGNAL]);
                pthread_sigmask(SIG_BLOCK, new, NULL);
        }
#endif
        process->process.env = NULL;
        ecl_unlist_process(process);
        mp_barrier_unblock(3, process->process.exit_barrier, @':disable', ECL_T);
        ecl_set_process_env(NULL);
        if (env) _ecl_dealloc_env(env);
        AO_store_release((AO_t*)&process->process.phase, ECL_PROCESS_INACTIVE);
}

#ifdef ECL_WINDOWS_THREADS
static DWORD WINAPI thread_entry_point(void *arg)
#else
static void *
thread_entry_point(void *arg)
#endif
{
        cl_object process = (cl_object)arg;
        cl_env_ptr env = process->process.env;

        /*
         * Upon entering this routine
         *      process.env = our environment for lisp
         *      process.phase = ECL_PROCESS_BOOTING
         *      signals are disabled in the environment
         *      the communication interrupt is disabled (sigmasked)
         *
         * This process will not receive signals that originate from
         * other processes. Furthermore, we expect not to get any
         * other interrupts (SIGSEGV, SIGFPE) if we do things right.
         */
        /* 1) Setup the environment for the execution of the thread */
        ecl_set_process_env(env = process->process.env);
#ifndef ECL_WINDOWS_THREADS
        pthread_cleanup_push(thread_cleanup, (void *)process);
#endif
        ecl_cs_set_org(env);
        ecl_get_spinlock(env, &process->process.start_spinlock);
        print_lock("ENVIRON %p %p %p %p", ECL_NIL, process,
                   env->bds_org, env->bds_top, env->bds_limit);

        /* 2) Execute the code. The CATCH_ALL point is the destination
        *     provides us with an elegant way to exit the thread: we just
        *     do an unwind up to frs_top.
        */
        ECL_CATCH_ALL_BEGIN(env) {
#ifdef HAVE_SIGPROCMASK
                {
                sigset_t *new = (sigset_t*)env->default_sigmask;
                pthread_sigmask(SIG_SETMASK, new, NULL);
                }
#endif
                process->process.phase = ECL_PROCESS_ACTIVE;
                ecl_enable_interrupts_env(env);
                si_trap_fpe(@'last', ECL_T);
                ecl_bds_bind(env, @'mp::*current-process*', process);

                ECL_RESTART_CASE_BEGIN(env, @'abort') {
                        env->values[0] = cl_apply(2, process->process.function,
                                                  process->process.args);
                        {
                                cl_object output = ECL_NIL;
                                int i = env->nvalues;
                                while (i--) {
                                        output = CONS(env->values[i], output);
                                }
                                process->process.exit_values = output;
                        }
                } ECL_RESTART_CASE(1,args) {
                        /* ABORT restart. */
                        process->process.exit_values = args;
                } ECL_RESTART_CASE_END;
                /* This will disable interrupts during the exit
                 * so that the unwinding is not interrupted. */
                process->process.phase = ECL_PROCESS_EXITING;
                ecl_bds_unwind1(env);
        } ECL_CATCH_ALL_END;

        /* 4) If everything went right, we should be exiting the thread
         *    through this point. thread_cleanup is automatically invoked
         *    marking the process as inactive.
         */
#ifdef ECL_WINDOWS_THREADS
        thread_cleanup(process);
        return 1;
#else
        pthread_cleanup_pop(1);
        return NULL;
#endif
}

static cl_object
alloc_process(cl_object name, cl_object initial_bindings)
{
        cl_object process = ecl_alloc_object(t_process), array;
        process->process.phase = ECL_PROCESS_INACTIVE;
        process->process.name = name;
        process->process.function = ECL_NIL;
        process->process.args = ECL_NIL;
        process->process.interrupt = ECL_NIL;
        process->process.exit_values = ECL_NIL;
        process->process.env = NULL;
        if (initial_bindings != OBJNULL) {
                array = si_make_vector(ECL_T, ecl_make_fixnum(256),
                                       ECL_NIL, ECL_NIL, ECL_NIL, ECL_NIL);
                si_fill_array_with_elt(array, ECL_NO_TL_BINDING, ecl_make_fixnum(0), ECL_NIL);
        } else {
                array = cl_copy_seq(ecl_process_env()->bindings_array);
        }
        process->process.initial_bindings = array;
        process->process.woken_up = ECL_NIL;
        process->process.start_spinlock = ECL_NIL;
        process->process.queue_record = ecl_list1(process);
        /* Creates the exit barrier so that processes can wait for termination,
         * but it is created in a disabled state. */
        process->process.exit_barrier = ecl_make_barrier(name, MOST_POSITIVE_FIXNUM);
        mp_barrier_unblock(3, process->process.exit_barrier, @':disable', ECL_T);
        return process;
}

bool
ecl_import_current_thread(cl_object name, cl_object bindings)
{
        struct cl_env_struct env_aux[1];
        cl_object process;
        pthread_t current;
        cl_env_ptr env;
        int registered;
        struct GC_stack_base stack;
#ifdef ECL_WINDOWS_THREADS
        {
        HANDLE aux = GetCurrentThread();
        DuplicateHandle(GetCurrentProcess(),
                        aux,
                        GetCurrentProcess(),
                        &current,
                        0,
                        FALSE,
                        DUPLICATE_SAME_ACCESS);
        CloseHandle(current);
        }
#else
        current = pthread_self();
#endif
#ifdef GBC_BOEHM
        GC_get_stack_base(&stack);
        switch (GC_register_my_thread(&stack)) {
        case GC_SUCCESS:
                registered = 1;
                break;
        case GC_DUPLICATE:
                /* Thread was probably created using the GC hooks
                 * for thread creation */
                registered = 0;
                break;
        default:
                return 0;
        }
#endif
        {
                cl_object processes = cl_core.processes;
                cl_index i, size;
                for (i = 0, size = processes->vector.dim; i < size; i++) {
                        cl_object p = processes->vector.self.t[i];
                        if (!Null(p) && p->process.thread == current)
                                return 0;
                }
        }
        /* We need a fake env to allow for interrupts blocking. */
        env_aux->disable_interrupts = 1;
        ecl_set_process_env(env_aux);
        env = _ecl_alloc_env(0);
        ecl_set_process_env(env);
        env->cleanup = registered;

        /* Link environment and process together */
        env->own_process = process = alloc_process(name, bindings);
        process->process.env = env;
        process->process.phase = ECL_PROCESS_BOOTING;
        process->process.thread = current;
        ecl_list_process(process);

        ecl_init_env(env);
        env->bindings_array = process->process.initial_bindings;
        env->thread_local_bindings_size = env->bindings_array->vector.dim;
        env->thread_local_bindings = env->bindings_array->vector.self.t;
        ecl_enable_interrupts_env(env);

        /* Activate the barrier so that processes can immediately start waiting. */
        mp_barrier_unblock(1, process->process.exit_barrier);
        process->process.phase = ECL_PROCESS_ACTIVE;

        ecl_bds_bind(env, @'mp::*current-process*', process);
        return 1;
}

void
ecl_release_current_thread(void)
{
        cl_env_ptr env = ecl_process_env();
        int cleanup = env->cleanup;
        thread_cleanup(env->own_process);
#ifdef GBC_BOEHM
        if (cleanup) {
                GC_unregister_my_thread();
        }
#endif
}

@(defun mp::make-process (&key name ((:initial-bindings initial_bindings) ECL_T))
        cl_object process;
@
        process = alloc_process(name, initial_bindings);
        @(return process)
@)

cl_object
mp_process_preset(cl_narg narg, cl_object process, cl_object function, ...)
{
        ecl_va_list args;
        ecl_va_start(args, function, narg, 2);
        if (narg < 2)
                FEwrong_num_arguments(@[mp::process-preset]);
        assert_type_process(process);
        process->process.function = function;
        process->process.args = cl_grab_rest_args(args);
        @(return process)
}

cl_object
mp_interrupt_process(cl_object process, cl_object function)
{
        unlikely_if (mp_process_active_p(process) == ECL_NIL)
                FEerror("Cannot interrupt the inactive process ~A", 1, process);
        ecl_interrupt_process(process, function);
        @(return ECL_T)
}

cl_object
mp_suspend_loop()
{
        cl_env_ptr env = ecl_process_env();
        ECL_CATCH_BEGIN(env,@'mp::suspend-loop') {
                for ( ; ; ) {
                        cl_sleep(ecl_make_fixnum(100));
                }
        } ECL_CATCH_END;
        ecl_return0(env);
}

cl_object
mp_break_suspend_loop()
{
        cl_env_ptr the_env = ecl_process_env();
        if (frs_sch(@'mp::suspend-loop')) {
                cl_throw(@'mp::suspend-loop');
        }
        ecl_return0(the_env);
}

cl_object
mp_process_suspend(cl_object process)
{
        return mp_interrupt_process(process, @'mp::suspend-loop');
}

cl_object
mp_process_resume(cl_object process)
{
        return mp_interrupt_process(process, @'mp::break-suspend-loop');
}

cl_object
mp_process_kill(cl_object process)
{
        return mp_interrupt_process(process, @'mp::exit-process');
}

cl_object
mp_process_yield(void)
{
        ecl_process_yield();
        @(return)
}

cl_object
mp_process_enable(cl_object process)
{
        cl_env_ptr process_env;
        int ok;
        /* Try to gain exclusive access to the process at the same
         * time we ensure that it is inactive. This prevents two
         * concurrent calls to process-enable from different threads
         * on the same process */
        unlikely_if (!AO_compare_and_swap_full((AO_t*)&process->process.phase,
                                               ECL_PROCESS_INACTIVE,
                                               ECL_PROCESS_BOOTING)) {
                FEerror("Cannot enable the running process ~A.", 1, process);
        }
        process->process.parent = mp_current_process();
        process->process.trap_fpe_bits =
                process->process.parent->process.env->trap_fpe_bits;
        ecl_list_process(process);

        /* Link environment and process together */
        process_env = _ecl_alloc_env(ecl_process_env());
        process_env->own_process = process;
        process->process.env = process_env;

        ecl_init_env(process_env);
        process_env->trap_fpe_bits = process->process.trap_fpe_bits;
        process_env->bindings_array = process->process.initial_bindings;
        process_env->thread_local_bindings_size = 
                process_env->bindings_array->vector.dim;
        process_env->thread_local_bindings =
                process_env->bindings_array->vector.self.t;

        /* Activate the barrier so that processes can immediately start waiting. */
        mp_barrier_unblock(1, process->process.exit_barrier);

        /* Block the thread with this spinlock until it is ready */
        process->process.start_spinlock = ECL_T;

#ifdef ECL_WINDOWS_THREADS
        {
        HANDLE code;
        DWORD threadId;

        code = (HANDLE)CreateThread(NULL, 0, thread_entry_point, process, 0, &threadId);
        ok = (process->process.thread = code) != NULL;
        }
#else
        {
        int code;
        pthread_attr_t pthreadattr;

        pthread_attr_init(&pthreadattr);
        pthread_attr_setdetachstate(&pthreadattr, PTHREAD_CREATE_DETACHED);
        /*
         * We launch the thread with the signal mask specified in cl_core.
         * The reason is that we might need to block certain signals
         * to be processed by the signal handling thread in unixint.d
         */
#ifdef HAVE_SIGPROCMASK
        {
                sigset_t new, previous;
                sigfillset(&new);
                pthread_sigmask(SIG_BLOCK, &new, &previous);
                code = pthread_create(&process->process.thread, &pthreadattr,
                                      thread_entry_point, process);
                pthread_sigmask(SIG_SETMASK, &previous, NULL);
        }
#else
        code = pthread_create(&process->process.thread, &pthreadattr,
                              thread_entry_point, process);
#endif
        ok = (code == 0);
        }
#endif
        if (!ok) {
                ecl_unlist_process(process);
                /* Disable the barrier and alert possible waiting processes. */
                mp_barrier_unblock(3, process->process.exit_barrier,
                                   @':disable', ECL_T);
                process->process.phase = ECL_PROCESS_INACTIVE;
                process->process.env = NULL;
                _ecl_dealloc_env(process_env);
        }
        /* Unleash the thread */
        process->process.start_spinlock = ECL_NIL;

        @(return (ok? process : ECL_NIL))
}

cl_object
mp_exit_process(void)
{
        /* We simply undo the whole of the frame stack. This brings up
           back to the thread entry point, going through all possible
           UNWIND-PROTECT.
        */
        const cl_env_ptr the_env = ecl_process_env();
        ecl_unwind(the_env, the_env->frs_org);
        /* Never reached */
}

cl_object
mp_all_processes(void)
{
        /* No race condition here because this list is never destructively
         * modified. When we add or remove processes, we create new lists. */
        @(return ecl_process_list())
}

cl_object
mp_process_name(cl_object process)
{
        assert_type_process(process);
        @(return process->process.name)
}

cl_object
mp_process_active_p(cl_object process)
{
        assert_type_process(process);
        @(return (process->process.phase? ECL_T : ECL_NIL))
}

cl_object
mp_process_whostate(cl_object process)
{
        assert_type_process(process);
        @(return (cl_core.null_string))
}

cl_object
mp_process_join(cl_object process)
{
        assert_type_process(process);
        if (process->process.phase) {
                /* We try to acquire a lock that is only owned by the process
                 * while it is active. */
                mp_barrier_wait(1, process->process.exit_barrier);
        }
        return cl_values_list(process->process.exit_values);
}

cl_object
mp_process_run_function(cl_narg narg, cl_object name, cl_object function, ...)
{
        cl_object process;
        ecl_va_list args;
        ecl_va_start(args, function, narg, 2);
        if (narg < 2)
                FEwrong_num_arguments(@[mp::process-run-function]);
        if (CONSP(name)) {
                process = cl_apply(2, @'mp::make-process', name);
        } else {
                process = mp_make_process(2, @':name', name);
        }
        cl_apply(4, @'mp::process-preset', process, function,
                 cl_grab_rest_args(args));
        return mp_process_enable(process);
}

cl_object
mp_process_run_function_wait(cl_narg narg, ...)
{
        cl_object process;
        ecl_va_list args;
        ecl_va_start(args, narg, narg, 0);
        process = cl_apply(2, @'mp::process-run-function',
                           cl_grab_rest_args(args));
        if (!Null(process)) {
                ecl_def_ct_single_float(wait, 0.001, static, const);
                while (process->process.phase < ECL_PROCESS_ACTIVE) {
                        cl_sleep(wait);
                }
        }
        @(return process)
}

/*----------------------------------------------------------------------
 * INTERRUPTS
 */

#ifndef ECL_WINDOWS_THREADS
static cl_object
mp_get_sigmask(void)
{
        cl_object data = ecl_alloc_simple_vector(sizeof(sigset_t), ecl_aet_b8);
        sigset_t *mask_ptr = (sigset_t*)data->vector.self.b8;
        sigset_t no_signals;
        sigemptyset(&no_signals);
        if (pthread_sigmask(SIG_BLOCK, &no_signals, mask_ptr))
                FElibc_error("MP:GET-SIGMASK failed in a call to pthread_sigmask", 0);
        @(return data)
}

static cl_object
mp_set_sigmask(cl_object data)
{
        sigset_t *mask_ptr = (sigset_t*)data->vector.self.b8;
        if (pthread_sigmask(SIG_SETMASK, mask_ptr, NULL))
                FElibc_error("MP:SET-SIGMASK failed in a call to pthread_sigmask", 0);
        @(return data)
}
#endif

cl_object
mp_block_signals(void)
{
#ifdef ECL_WINDOWS_THREADS
        cl_env_ptr the_env = ecl_process_env();
        cl_object previous = ecl_symbol_value(@'ext::*interrupts-enabled*');
        ECL_SETQ(the_env, @'ext::*interrupts-enabled*', ECL_NIL);
        @(return previous)
#else
        cl_object previous = mp_get_sigmask();
        sigset_t all_signals;
        sigfillset(&all_signals);
        if (pthread_sigmask(SIG_SETMASK, &all_signals, NULL))
                FElibc_error("MP:BLOCK-SIGNALS failed in a call to pthread_sigmask",0);
        @(return previous)
#endif
}

cl_object
mp_restore_signals(cl_object sigmask)
{
#ifdef ECL_WINDOWS_THREADS
        cl_env_ptr the_env = ecl_process_env();
        ECL_SETQ(the_env, @'ext::*interrupts-enabled*', sigmask);
        ecl_check_pending_interrupts(the_env);
        @(return sigmask)
#else
        return mp_set_sigmask(sigmask);
#endif
}

/*----------------------------------------------------------------------
 * INITIALIZATION
 */

void
init_threads(cl_env_ptr env)
{
        cl_object process;
        pthread_t main_thread;

        cl_core.processes = OBJNULL;

        /* We have to set the environment before any allocation takes place,
         * so that the interrupt handling code works. */
#if !defined(WITH___THREAD)
# if defined(ECL_WINDOWS_THREADS)
        cl_env_key = TlsAlloc();
# else
        pthread_key_create(&cl_env_key, NULL);
# endif
#endif
        ecl_set_process_env(env);

#ifdef ECL_WINDOWS_THREADS
        {
        HANDLE aux = GetCurrentThread();
        DuplicateHandle(GetCurrentProcess(),
                        aux,
                        GetCurrentProcess(),
                        &main_thread,
                        0,
                        FALSE,
                        DUPLICATE_SAME_ACCESS);
        }
#else
        main_thread = pthread_self();
#endif
        process = ecl_alloc_object(t_process);
        process->process.phase = ECL_PROCESS_ACTIVE;
        process->process.name = @'si::top-level';
        process->process.function = ECL_NIL;
        process->process.args = ECL_NIL;
        process->process.thread = main_thread;
        process->process.env = env;
        process->process.woken_up = ECL_NIL;
        process->process.queue_record = ecl_list1(process);
        process->process.start_spinlock = ECL_NIL;
        process->process.exit_barrier = ecl_make_barrier(process->process.name, MOST_POSITIVE_FIXNUM);

        env->own_process = process;

        {
                cl_object v = si_make_vector(ECL_T, /* Element type */
                                           ecl_make_fixnum(256), /* Size */
                                           ecl_make_fixnum(0), /* fill pointer */
                                           ECL_NIL, ECL_NIL, ECL_NIL);
                v->vector.self.t[0] = process;
                v->vector.fillp = 1;
                cl_core.processes = v;
                cl_core.global_lock = ecl_make_lock(@'mp::global-lock', 1);
                cl_core.error_lock = ecl_make_lock(@'mp::error-lock', 1);
                cl_core.global_env_lock = ecl_make_rwlock(@'ext::package-lock');
        }
}