/* * process.c - process related management * * Authors Ghassan Almaless (2008,2009,2010,2011,2012) * Mohamed Lamine Karaoui (2015) * Alain Greiner (2016,2017) * * Copyright (c) UPMC Sorbonne Universites * * This file is part of ALMOS-MKH.. * * ALMOS-MKH is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2.0 of the License. * * ALMOS-MKH is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with ALMOS-MKH; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include ////////////////////////////////////////////////////////////////////////////////////////// // Extern global variables ////////////////////////////////////////////////////////////////////////////////////////// extern process_t process_zero; ////////////////////////////////////////////////////////////////////////////////////////// // Process initialisation related functions ////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////// process_t * process_alloc() { kmem_req_t req; req.type = KMEM_PROCESS; req.size = sizeof(process_t); req.flags = AF_KERNEL; return (process_t *)kmem_alloc( &req ); } //////////////////////////////////////// void process_free( process_t * process ) { kmem_req_t req; req.type = KMEM_PROCESS; req.ptr = process; kmem_free( &req ); } ///////////////////////////////////////////// void process_zero_init( process_t * process ) { // initialize PID, PPID anf PREF process->pid = 0; process->ppid = 0; process->ref_xp = XPTR( local_cxy , process ); // reset th_tbl[] array as empty uint32_t i; for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ ) { process->th_tbl[i] = NULL; } process->th_nr = 0; spinlock_init( &process->th_lock ); hal_fence(); process_dmsg("\n[DBG] %s : core[%x,%d] exit for process %x\n", __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , process->pid ); } // end process_zero_init() ///////////////////////////////////////////////// void process_reference_init( process_t * process, pid_t pid, pid_t ppid, xptr_t model_xp ) { cxy_t model_cxy; process_t * model_ptr; error_t error1; error_t error2; error_t error3; xptr_t stdin_xp; xptr_t stdout_xp; xptr_t stderr_xp; uint32_t stdin_id; uint32_t stdout_id; uint32_t stderr_id; process_dmsg("\n[DBG] %s : core[%x,%d] enters for process %x\n", __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , pid ); // get model process cluster and local pointer model_cxy = GET_CXY( model_xp ); model_ptr = (process_t *)GET_PTR( model_xp ); // initialize PID, PPID, and REF process->pid = pid; process->ppid = ppid; process->ref_xp = XPTR( local_cxy , process ); // initialize vmm vmm_init( process ); process_dmsg("\n[DBG] %s : core[%x,%d] / vmm empty for process %x\n", __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , pid ); // initialize fd_array (not for kernel) process_fd_init( process ); // create stdin / stdout / stderr pseudo-files if( ppid == 0 ) // process_init { error1 = vfs_open( process, CONFIG_INIT_STDIN, O_RDONLY, 0, // FIXME chmod &stdin_xp, &stdin_id ); error2 = vfs_open( process, CONFIG_INIT_STDOUT, O_WRONLY, 0, // FIXME chmod &stdout_xp, &stdout_id ); error3 = vfs_open( process, CONFIG_INIT_STDERR, O_WRONLY, 0, // FIXME chmod &stderr_xp, &stderr_id ); } else // other user process { error1 = vfs_open( process, CONFIG_USER_STDIN, O_RDONLY, 0, // FIXME chmod &stdin_xp, &stdin_id ); error2 = vfs_open( process, CONFIG_USER_STDOUT, O_WRONLY, 0, // FIXME chmod &stdout_xp, &stdout_id ); error3 = vfs_open( process, CONFIG_USER_STDERR, O_WRONLY, 0, // FIXME chmod &stderr_xp, &stderr_id ); } assert( ((error1 == 0) && (error2 == 0) && (error3 == 0)) , __FUNCTION__ , "cannot open stdin/stdout/stderr pseudo files\n"); assert( ((stdin_id == 0) && (stdout_id == 1) && (stderr_id == 2)) , __FUNCTION__ , "bad indexes : stdin %d / stdout %d / stderr %d \n", stdin_id , stdout_id , stderr_id ); // initialize specific files, cwd_lock, and fd_array process->vfs_root_xp = (xptr_t)hal_remote_lwd( XPTR( model_cxy, &model_ptr->vfs_root_xp ) ); process->vfs_cwd_xp = (xptr_t)hal_remote_lwd( XPTR( model_cxy, &model_ptr->vfs_cwd_xp ) ); process->vfs_bin_xp = (xptr_t)hal_remote_lwd( XPTR( model_cxy, &model_ptr->vfs_bin_xp ) ); vfs_file_count_up( process->vfs_root_xp ); vfs_file_count_up( process->vfs_cwd_xp ); vfs_file_count_up( process->vfs_bin_xp ); process_fd_remote_copy( XPTR( local_cxy , &process->fd_array ), XPTR( model_cxy , &model_ptr->fd_array ) ); remote_rwlock_init( XPTR( local_cxy , &process->cwd_lock ) ); process_dmsg("\n[DBG] %s : core[%x,%d] / fd array initialised for process %x\n", __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , pid ); // reset children list root xlist_root_init( XPTR( local_cxy , &process->children_root ) ); process->children_nr = 0; // reset semaphore / mutex / barrier / condvar list roots xlist_root_init( XPTR( local_cxy , &process->sem_root ) ); xlist_root_init( XPTR( local_cxy , &process->mutex_root ) ); xlist_root_init( XPTR( local_cxy , &process->barrier_root ) ); xlist_root_init( XPTR( local_cxy , &process->condvar_root ) ); remote_spinlock_init( XPTR( local_cxy , &process->sync_lock ) ); // register new process in the local cluster manager pref_tbl[] lpid_t lpid = LPID_FROM_PID( pid ); LOCAL_CLUSTER->pmgr.pref_tbl[lpid] = XPTR( local_cxy , process ); // register new process descriptor in local cluster manager local_list cluster_process_local_link( process ); // register new process descriptor in local cluster manager copies_list cluster_process_copies_link( process ); // reset th_tbl[] array as empty in process descriptor uint32_t i; for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ ) { process->th_tbl[i] = NULL; } process->th_nr = 0; spinlock_init( &process->th_lock ); hal_fence(); process_dmsg("\n[DBG] %s : core[%x,%d] exit for process %x\n", __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , pid ); } // process_reference init() ///////////////////////////////////////////////////// error_t process_copy_init( process_t * local_process, xptr_t reference_process_xp ) { // get reference process cluster and local pointer cxy_t ref_cxy = GET_CXY( reference_process_xp ); process_t * ref_ptr = (process_t *)GET_PTR( reference_process_xp ); // set the pid, ppid, ref_xp fields in local process local_process->pid = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->pid ) ); local_process->ppid = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->ppid ) ); local_process->ref_xp = reference_process_xp; process_dmsg("\n[DBG] %s : core[%x,%d] enters for process %x in cluster %x\n", __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , local_process->pid ); // reset local process vmm vmm_init( local_process ); // reset process file descriptors array process_fd_init( local_process ); // reset vfs_root_xp / vfs_bin_xp / vfs_cwd_xp fields local_process->vfs_root_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_root_xp ) ); local_process->vfs_bin_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_bin_xp ) ); local_process->vfs_cwd_xp = XPTR_NULL; // reset children list root (not used in a process descriptor copy) xlist_root_init( XPTR( local_cxy , &local_process->children_root ) ); local_process->children_nr = 0; // reset brothers list (not used in a process descriptor copy) xlist_entry_init( XPTR( local_cxy , &local_process->brothers_list ) ); // reset semaphores list root (not used in a process descriptor copy) xlist_root_init( XPTR( local_cxy , &local_process->sem_root ) ); xlist_root_init( XPTR( local_cxy , &local_process->mutex_root ) ); xlist_root_init( XPTR( local_cxy , &local_process->barrier_root ) ); xlist_root_init( XPTR( local_cxy , &local_process->condvar_root ) ); // reset th_tbl[] array as empty uint32_t i; for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ ) { local_process->th_tbl[i] = NULL; } local_process->th_nr = 0; spinlock_init( &local_process->th_lock ); // register new process descriptor in local cluster manager local_list cluster_process_local_link( local_process ); // register new process descriptor in owner cluster manager copies_list cluster_process_copies_link( local_process ); // initialize signal manager TODO [AG] hal_fence(); process_dmsg("\n[DBG] %s : core[%x,%d] exit for process %x in cluster %x\n", __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , local_process->pid ); return 0; } // end process_copy_init() /////////////////////////////////////////// void process_destroy( process_t * process ) { if( process->th_nr != 0 ) { panic("process %x in cluster %x has still active threads", process->pid , local_cxy ); } // get local process manager pointer pmgr_t * pmgr = &LOCAL_CLUSTER->pmgr; // get the lock protecting the list of local process descriptors remote_spinlock_lock( XPTR( local_cxy , &pmgr->local_lock ) ); // remove the process descriptor from local_list in local cluster manager xlist_unlink( XPTR( local_cxy , &process->local_list ) ); // release the lock protecting the list of local process descriptors remote_spinlock_unlock( XPTR( local_cxy , &pmgr->local_lock ) ); // get extended pointer on copies_lock in owner cluster manager cxy_t owner_cxy = CXY_FROM_PID( process->pid ); lpid_t lpid = LPID_FROM_PID( process->pid ); xptr_t copies_lock = XPTR( owner_cxy , &pmgr->copies_lock[lpid] ); // remove the local process descriptor from copies_list remote_spinlock_lock( copies_lock ); xlist_unlink( XPTR( local_cxy , &process->copies_list ) ); remote_spinlock_unlock( copies_lock ); // synchronize memory hal_fence(); // From this point, the process descriptor is unreachable // close all open files and update dirty TODO [AG] // release signal manager TODO [AG] // Decrease refcount for bin file, root file and cwd file if( process->vfs_bin_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_bin_xp ); if( process->vfs_root_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_root_xp ); if( process->vfs_cwd_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_cwd_xp ); // Destroy VMM vmm_destroy( process ); process_dmsg("\n[DBG] %s for pid %d / page_faults = %d\n", __FUNCTION__ , process->pid, process->vmm.pgfault_nr ); } // end process_destroy() //////////////////////////////////////// void process_kill( process_t * process ) { thread_t * thread; // pointer on current thead descriptor uint32_t ltid; // index in process th_tbl uint32_t count; // thread counter printk("\n[@@@] %s enter\n", __FUNCTION__ ); // get lock protecting th_tbl[] spinlock_lock( &process->th_lock ); // first loop on threads to send the THREAD_SIG_KILL signal to all process threads // we use both "ltid" and "count" indexes, because it can exist "holes" in th_tbl for( ltid = 0 , count = 0 ; (ltid < CONFIG_THREAD_MAX_PER_CLUSTER) && (count < process->th_nr) ; ltid++ ) { thread = process->th_tbl[ltid]; if( thread != NULL ) { thread_kill( thread ); count++; } } printk("\n[@@@] %s : %d signal(s) sent\n", __FUNCTION__, count ); // second loop on threads to wait acknowledge from scheduler, // unlink thread from process and parent thread, and release thread descriptor for( ltid = 0 , count = 0 ; (ltid < CONFIG_THREAD_MAX_PER_CLUSTER) && (count < process->th_nr) ; ltid++ ) { thread = process->th_tbl[ltid]; if( thread != NULL ) { printk("\n[@@@] %s start polling at cycle %d\n", __FUNCTION__ , hal_time_stamp() ); // poll the THREAD_SIG_KILL bit until reset while( thread->signals & THREAD_SIG_KILL ) asm volatile( "nop" ); printk("\n[@@@] %s exit polling\n", __FUNCTION__ ); // detach target thread from parent if attached if( (thread->flags & THREAD_FLAG_DETACHED) != 0 ) thread_child_parent_unlink( thread->parent , XPTR( local_cxy , thread ) ); // unlink thread from process process_remove_thread( thread ); // release memory for thread descriptor thread_destroy( thread ); count++; } } printk("\n[@@@] %s : %d ack(s) received\n", __FUNCTION__, count ); // release lock protecting th_tbl[] spinlock_unlock( &process->th_lock ); // release memory allocated for process descriptor process_destroy( process ); printk("\n[DBG] %s : core[%x,%d] exit\n", __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid ); } // end process_kill() /////////////////////////////////////////////// process_t * process_get_local_copy( pid_t pid ) { error_t error; process_t * process_ptr; // local pointer on process xptr_t process_xp; // extended pointer on process cluster_t * cluster = LOCAL_CLUSTER; // get lock protecting local list of processes remote_spinlock_lock( XPTR( local_cxy , &cluster->pmgr.local_lock ) ); // scan the local list of process descriptors to find the process xptr_t iter; bool_t found = false; XLIST_FOREACH( XPTR( local_cxy , &cluster->pmgr.local_root ) , iter ) { process_xp = XLIST_ELEMENT( iter , process_t , local_list ); process_ptr = (process_t *)GET_PTR( process_xp ); if( process_ptr->pid == pid ) { found = true; break; } } // release lock protecting local list of processes remote_spinlock_unlock( XPTR( local_cxy , &cluster->pmgr.local_lock ) ); // allocate memory for a new local process descriptor // and initialise it from reference cluster if required if( !found ) { // get extended pointer on reference process descriptor xptr_t ref_xp = cluster_get_reference_process_from_pid( pid ); assert( (ref_xp != XPTR_NULL) , __FUNCTION__ , "illegal pid\n" ); // allocate memory for local process descriptor process_ptr = process_alloc(); if( process_ptr == NULL ) return NULL; // initialize local process descriptor copy error = process_copy_init( process_ptr , ref_xp ); if( error ) return NULL; } return process_ptr; } ////////////////////////////////////////////////////////////////////////////////////////// // File descriptor array related functions ////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////// void process_fd_init( process_t * process ) { uint32_t fd; remote_spinlock_init( XPTR( local_cxy , &process->fd_array.lock ) ); process->fd_array.current = 0; // initialize array for ( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ ) { process->fd_array.array[fd] = XPTR_NULL; } } ////////////////////////////// bool_t process_fd_array_full() { // get extended pointer on reference process xptr_t ref_xp = CURRENT_THREAD->process->ref_xp; // get reference process cluster and local pointer process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); cxy_t ref_cxy = GET_CXY( ref_xp ); // get number of open file descriptors from reference fd_array uint32_t current = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->fd_array.current ) ); return ( current >= CONFIG_PROCESS_FILE_MAX_NR ); } ///////////////////////////////////////////////// error_t process_fd_register( process_t * process, xptr_t file_xp, uint32_t * fdid ) { bool_t found; uint32_t id; xptr_t xp; // get reference process cluster and local pointer xptr_t ref_xp = process->ref_xp; process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); cxy_t ref_cxy = GET_CXY( ref_xp ); // take lock protecting reference fd_array remote_spinlock_lock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) ); found = false; for ( id = 0; id < CONFIG_PROCESS_FILE_MAX_NR ; id++ ) { xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) ); if ( xp == XPTR_NULL ) { found = true; hal_remote_swd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) , file_xp ); hal_remote_atomic_add( XPTR( ref_cxy , &ref_ptr->fd_array.current ) , 1 ); *fdid = id; break; } } // release lock protecting reference fd_array remote_spinlock_unlock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) ); if ( !found ) return EMFILE; else return 0; } //////////////////////////////////////////////// xptr_t process_fd_get_xptr( process_t * process, uint32_t fdid ) { xptr_t file_xp; // access local copy of process descriptor file_xp = process->fd_array.array[fdid]; if( file_xp == XPTR_NULL ) { // get reference process cluster and local pointer xptr_t ref_xp = process->ref_xp; cxy_t ref_cxy = GET_CXY( ref_xp ); process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); // access reference process descriptor file_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[fdid] ) ); // update local fd_array if found if( file_xp != XPTR_NULL ) { process->fd_array.array[fdid] = file_xp; } } return file_xp; } // end process_fd_get_xptr() /////////////////////////////////////////// void process_fd_remote_copy( xptr_t dst_xp, xptr_t src_xp ) { uint32_t fd; xptr_t entry; // get cluster and local pointer for src fd_array cxy_t src_cxy = GET_CXY( src_xp ); fd_array_t * src_ptr = (fd_array_t *)GET_PTR( src_xp ); // get cluster and local pointer for dst fd_array cxy_t dst_cxy = GET_CXY( dst_xp ); fd_array_t * dst_ptr = (fd_array_t *)GET_PTR( dst_xp ); // get the remote lock protecting the src fd_array remote_spinlock_lock( XPTR( src_cxy , &src_ptr->lock ) ); // loop on all entries in source process fd_array for( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ ) { entry = (xptr_t)hal_remote_lwd( XPTR( src_cxy , &src_ptr->array[fd] ) ); if( entry != XPTR_NULL ) { // increment file descriptor ref count vfs_file_count_up( entry ); // copy entry in destination process fd_array hal_remote_swd( XPTR( dst_cxy , &dst_ptr->array[fd] ) , entry ); } } // release lock on source process fd_array remote_spinlock_unlock( XPTR( src_cxy , &src_ptr->lock ) ); } // end process_fd_remote_copy() //////////////////////////////////////////////////////////////////////////////////// // Thread related functions //////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////// error_t process_register_thread( process_t * process, thread_t * thread, trdid_t * trdid ) { ltid_t ltid; bool_t found; assert( (process != NULL) , __FUNCTION__ , "process argument is NULL" ); assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" ); // search a free slot in th_tbl[] // 0 is not a valid ltid value found = false; for( ltid = 1 ; ltid < CONFIG_THREAD_MAX_PER_CLUSTER ; ltid++ ) { if( process->th_tbl[ltid] == NULL ) { found = true; break; } } if( found ) { // register thread in th_tbl[] process->th_tbl[ltid] = thread; process->th_nr++; // returns trdid *trdid = TRDID( local_cxy , ltid ); } return (found) ? 0 : ENOMEM; } // end process_register_thread() /////////////////////////////////////////////// void process_remove_thread( thread_t * thread ) { assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" ); process_t * process = thread->process; // get thread local index ltid_t ltid = LTID_FROM_TRDID( thread->trdid ); // remove thread from th_tbl[] process->th_tbl[ltid] = NULL; process->th_nr--; } // process_remove_thread() ///////////////////////////////////////////////////////// error_t process_make_fork( xptr_t parent_process_xp, xptr_t parent_thread_xp, pid_t * child_pid, thread_t ** child_thread ) { process_t * process; // local pointer on child process descriptor thread_t * thread; // local pointer on child thread descriptor pid_t new_pid; // process identifier for child process pid_t parent_pid; // process identifier for parent process xptr_t ref_xp; // extended pointer on reference process error_t error; // get cluster and local pointer for parent process cxy_t parent_process_cxy = GET_CXY( parent_process_xp ); process_t * parent_process_ptr = (process_t *)GET_PTR( parent_process_xp ); // get parent process PID parent_pid = hal_remote_lw( XPTR( parent_process_cxy , &parent_process_ptr->pid ) ); // check parent process is the reference ref_xp = hal_remote_lwd( XPTR( parent_process_cxy , &parent_process_ptr->ref_xp ) ); assert( (parent_process_xp == ref_xp ) , __FUNCTION__ , "parent process must be the reference process\n" ); process_dmsg("\n[DBG] %s : core[%x,%d] enter at cycle %d\n", __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid , hal_get_cycles() ); // allocate a process descriptor process = process_alloc(); if( process == NULL ) { printk("\n[ERROR] in %s : cannot get process in cluster %x\n", __FUNCTION__, local_cxy ); return -1; } process_dmsg("\n[DBG] %s : core[%x,%d] child process descriptor allocated at cycle %d\n", __FUNCTION__ , local_cxy, CURRENT_THREAD->core->lid, hal_get_cycles() ); // allocate a child PID from local cluster error = cluster_pid_alloc( XPTR( local_cxy , process ) , &new_pid ); if( (error != 0) || (new_pid == 0) ) { printk("\n[ERROR] in %s : cannot get PID in cluster %x\n", __FUNCTION__, local_cxy ); process_free( process ); return -1; } process_dmsg("\n[DBG] %s : core[%x, %d] child process PID allocated = %x at cycle %d\n", __FUNCTION__ , local_cxy, CURRENT_THREAD->core->lid, new_pid , hal_get_cycles() ); // initializes child process descriptor from parent process descriptor process_reference_init( process, new_pid, parent_pid, parent_process_xp ); process_dmsg("\n[DBG] %s : core[%x, %d] child process initialised at cycle %d\n", __FUNCTION__ , local_cxy, CURRENT_THREAD->core->lid, hal_get_cycles() ); // copy VMM from parent descriptor to child descriptor error = vmm_fork_copy( process, parent_process_xp ); if( error ) { printk("\n[ERROR] in %s : cannot copy VMM in cluster %x\n", __FUNCTION__, local_cxy ); process_free( process ); cluster_pid_release( new_pid ); return -1; } process_dmsg("\n[DBG] %s : core[%x, %d] child process VMM copied at cycle %d\n", __FUNCTION__ , local_cxy, CURRENT_THREAD->core->lid, hal_get_cycles() ); // create child thread descriptor from parent thread descriptor error = thread_user_fork( parent_thread_xp, process, &thread ); if( error ) { printk("\n[ERROR] in %s : cannot create thread in cluster %x\n", __FUNCTION__, local_cxy ); process_free( process ); cluster_pid_release( new_pid ); return -1; } process_dmsg("\n[DBG] %s : core[%x,%d] child thread created at cycle %d\n", __FUNCTION__ , local_cxy, CURRENT_THREAD->core->lid, hal_get_cycles() ); // update parent process GPT to set Copy_On_Write for shared data vsegs // this includes all replicated GPT copies if( parent_process_cxy == local_cxy ) // reference is local { vmm_set_cow( parent_process_ptr ); } else // reference is remote { rpc_vmm_set_cow_client( parent_process_cxy, parent_process_ptr ); } process_dmsg("\n[DBG] %s : core[%x,%d] COW set in parent_process at cycle %d\n", __FUNCTION__ , local_cxy, CURRENT_THREAD->core->lid, hal_get_cycles() ); // update children list in parent process xlist_add_last( XPTR( parent_process_cxy , &parent_process_ptr->children_root ), XPTR( local_cxy , &process->brothers_list ) ); hal_remote_atomic_add( XPTR( parent_process_cxy, &parent_process_ptr->children_nr), 1 ); // vmm_display( process , true ); // vmm_display( parent_process_ptr , true ); // sched_display( 0 ); // return success *child_thread = thread; *child_pid = new_pid; return 0; } // end process_make_fork() ///////////////////////////////////////////////////// error_t process_make_exec( exec_info_t * exec_info ) { char * path; // pathname to .elf file process_t * old; // local pointer on old process process_t * new; // local pointer on new process pid_t pid; // old process identifier thread_t * thread; // pointer on new thread pthread_attr_t attr; // main thread attributes lid_t lid; // selected core local index error_t error; // get .elf pathname and PID from exec_info path = exec_info->path; pid = exec_info->pid; // check local cluster is old process owner assert( (CXY_FROM_PID( pid ) == local_cxy), __FUNCTION__, "local cluster %x is not owner for process %x\n", local_cxy, pid ); exec_dmsg("\n[DBG] %s : core[%x,%d] enters for process %x / path = %s\n", __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, pid , path ); // get old process local pointer old = (process_t *)cluster_get_local_process_from_pid( pid ); assert( (old != NULL ) , __FUNCTION__ , "process %x not found in cluster %x\n", pid , local_cxy ); // allocate memory for new process descriptor new = process_alloc(); // initialize new process descriptor process_reference_init( new, old->pid, // same as old old->ppid, // same as old XPTR( local_cxy , old ) ); exec_dmsg("\n[DBG] %s : core[%x,%d] created new process %x / path = %s\n", __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, pid, path ); // register "code" and "data" vsegs as well as entry-point // in new process VMM, using information contained in the elf file. if( elf_load_process( path , new ) ) { printk("\n[ERROR] in %s : failed to access .elf file for process %x / path = %s\n", __FUNCTION__, pid , path ); process_destroy( new ); return -1; } exec_dmsg("\n[DBG] %s : core[%x,%d] registered code/data vsegs / process %x / path = %s\n", __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, pid, path ); // select a core in local cluster to execute the main thread lid = cluster_select_local_core(); // initialize pthread attributes for main thread attr.attributes = PT_ATTR_DETACH | PT_ATTR_CLUSTER_DEFINED | PT_ATTR_CORE_DEFINED; attr.cxy = local_cxy; attr.lid = lid; // create and initialize thread descriptor error = thread_user_create( pid, (void *)new->vmm.entry_point, exec_info->args_pointers, &attr, &thread ); if( error ) { printk("\n[ERROR] in %s : cannot create thread for process %x / path = %s\n", __FUNCTION__, pid , path ); process_destroy( new ); return -1; } exec_dmsg("\n[DBG] %s : core[%x,%d] created main thread %x for new process %x\n", __FUNCTION__ , local_cxy, CURRENT_THREAD->core->lid, thread->trdid, pid ); // update children list (rooted in parent process) xlist_replace( XPTR( local_cxy , &old->brothers_list ) , XPTR( local_cxy , &new->brothers_list ) ); // FIXME request destruction of old process copies and threads in all clusters // activate new thread thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_GLOBAL ); exec_dmsg("\n[DBG] %s : core[%x,%d] exit for path = %s\n", __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, path ); return 0; } // end process_make_exec() ////////////////////////// void process_init_create() { exec_info_t exec_info; // structure to be passed to process_make_exec() process_t * process; // local pointer on process_init descriptor pid_t pid; // process_init identifier error_t error; process_dmsg("\n[DBG] %s : enters in cluster %x\n", __FUNCTION__ , local_cxy ); // allocates memory for process descriptor from local cluster process = process_alloc(); if( process == NULL ) { printk("\n[PANIC] in %s : no memory for process descriptor in cluster %x\n", __FUNCTION__, local_cxy ); } // get new PID from local cluster error = cluster_pid_alloc( XPTR( local_cxy , process ) , &pid ); if( error ) { printk("\n[PANIC] in %s : cannot allocate PID in cluster %x\n", __FUNCTION__, local_cxy ); } // initialise the process desciptor (parent is local kernel process) process_reference_init( process, pid, process_zero.pid, XPTR( local_cxy , &process_zero ) ); // initialize the exec_info structure exec_info.pid = pid; exec_info.args_nr = 0; exec_info.envs_nr = 0; strcpy( exec_info.path , CONFIG_PROCESS_INIT_PATH ); // update process descriptor and create thread descriptor error = process_make_exec( &exec_info ); if( error ) { printk("\n[PANIC] in %s : cannot exec %s in cluster %x\n", __FUNCTION__, CONFIG_PROCESS_INIT_PATH , local_cxy ); } process_dmsg("\n[DBG] %s : exit in cluster %x\n", __FUNCTION__ , local_cxy ); hal_fence(); } // end process_init_create()