source: trunk/user/init/init.c @ 528

Last change on this file since 528 was 528, checked in by nicolas.van.phan@…, 3 years ago

Change usage of y_max/x_max for iterating through clusters.

This is due to empty cluster (without memory or not CPU cluster),
like IO cluster of MIPS32 LETI architecture.

File size: 6.6 KB
RevLine 
[427]1///////////////////////////////////////////////////////////////////////////////////////
2// File   :  init.c
3// Date   :  January 2018
4// Author :  Alain Greiner
5///////////////////////////////////////////////////////////////////////////////////////
6// This single thread application implement the "init" process for ALMOS-MKH.
[434]7// It uses the fork/exec syscalls to create N KSH child processes
8// (one child process per user terminal).
9// Then calls the wait() function to block, and reactivate any child KSH process
10// that has been deleted, using a new fork/exec.
[440]11// It includes the hard_config.h file to get th NB_TXT_CHANNELS parameter.
[427]12///////////////////////////////////////////////////////////////////////////////////////
13
14#include <hard_config.h>
[444]15#include <unistd.h>
[427]16#include <stdlib.h>
17#include <stdio.h>
18#include <pthread.h>
[445]19#include <almosmkh.h>
[444]20#include <sys/wait.h>
[427]21
[442]22#define DEBUG_PROCESS_INIT    0
[440]23
[445]24// TODO make the cxy computation portable
25// and avoid this TSAR specific define [AG]
26
[440]27#define CXY_FROM_XY( x , y )  ((x<<4) + y)
28
[445]29// TODO improve the get_config() syscall to return nb_txt_channels
30// and avoid the hard_config include [AG]
31
[427]32//////////
[475]33int main( void )
[427]34{
[438]35    int           i;
36    int           ret_fork;      // fork return value 
37    int           ret_exec;      // exec return value 
38    int           rcv_pid;       // pid received from the wait syscall
39    int           status;        // used by the wait syscall
40    char          string[64];    // log messages on kernel TXT0
[427]41
42    // check number of TXT channels
[445]43    if( NB_TXT_CHANNELS < 2 )
44    {
45        printf("\n[ERROR] in init process : number of TXT channels must be larger than 1\n");
46        exit( EXIT_FAILURE );
47    }
[427]48
49    // create the KSH processes (one per user terminal)
[434]50    for( i = 1 ; i <  NB_TXT_CHANNELS ; i++ )
[427]51    {
[457]52
53#if DEBUG_PROCESS_INIT
54snprintf( string , 64 , "[INIT] start child[%d] creation" , i );
55display_string( string );
56#endif
57
[434]58        // INIT process fork process CHILD[i]
59        ret_fork = fork();
60
[436]61        if( ret_fork < 0 )   // error in fork
[427]62        {
[437]63            // INIT display error message 
[457]64            snprintf( string , 64 , "[INIT ERROR] cannot fork child[%d] => suicide" , i );
[427]65            display_string( string );
66
[436]67            // INIT suicide
[434]68            exit( 0 );
[427]69        }
[434]70        else if( ret_fork == 0 )                    // we are in CHILD[i] process
[427]71        {
[434]72            // CHILD[i] process exec process KSH[i]
[444]73            ret_exec = execve( "/bin/user/ksh.elf" , NULL , NULL ); 
[434]74
75            if ( ret_exec )   // error in exec             
[427]76            {
[437]77                // CHILD[i] display error message
[435]78                snprintf( string , 64 , 
[440]79                "[INIT ERROR] CHILD[%d] cannot exec KSH / ret_exec = %d" , i , ret_exec );
[434]80                display_string( string );
[427]81            }
82        }
[434]83        else                                      // we are in INIT process
84        {
[457]85            // INIT display CHILD[i] process PID
86            snprintf( string , 64 , "[INIT] created KSH[%d] / pid = %x", i , ret_fork ); 
87            display_string( string );
[434]88        }
89    } 
[440]90 
[442]91#if DEBUG_PROCESS_INIT
[528]92{
93    unsigned int  x_size;        // number of clusters in a row
94    unsigned int  y_size;        // number of clusters in a column
95    unsigned int  ncores;        // number of cores per cluster
96    unsigned int  x;             // cluster x coordinate
97    unsigned int  y;             // cluster y coordinate
98    unsigned int  cxy;           // cluster identifier
99    unsigned int  lid;           // core local index
[434]100
[528]101    // get hardware config
102    get_config( &x_size , &y_size , &ncores );
103
104    // INIT displays processes and threads in all clusters
105    for( x = 0 ; x < x_size ; x++ )
[440]106    {
[528]107        for( y = 0 ; y < y_size - 1 ; y++ )
108        {
109            cxy = CXY_FROM_XY( x , y );
110            display_cluster_processes( cxy );
111            for( lid = 0 ; lid < ncores ; lid++ )
112            {
113                display_sched( cxy , lid );
114            }
[440]115        }
116    }
[457]117}
[440]118#endif
119
[435]120    // This loop detects the termination of the KSH[i] processes,
[436]121    // and recreate a new KSH[i] process when required.
[427]122    while( 1 )
123    {
[435]124        // block on child processes termination
[436]125        rcv_pid = wait( &status );
[427]126
[435]127        if( WIFSTOPPED( status ) )                         // stopped => unblock it
128        {
129            // display string to report unexpected KSH process block
[440]130            snprintf( string , 64 , "[INIT] KSH process %x stopped => unblock it" , rcv_pid );
[435]131            display_string( string ); 
132
[440]133            // TODO : unblock KSH [AG]
[435]134
[436]135        }  // end KSH stopped handling
136
[435]137        if( WIFSIGNALED( status ) || WIFEXITED( status ) )  // killed => recreate it
138        {
[437]139            // display string to report KSH process termination
[440]140            snprintf( string , 64 , "[INIT] KSH process %x terminated => recreate", rcv_pid );
[435]141            display_string( string ); 
[436]142
143            // INIT process fork a new CHILD process
144            ret_fork = fork();
145
146            if( ret_fork < 0 )                          // error in fork
147            {
[437]148                // INIT display error message
[440]149                snprintf( string , 64 , "[INIT ERROR] cannot fork child => suicide");
[436]150                display_string( string );
151
152                // INIT suicide
153                exit( 0 );
154            }
155            else if( ret_fork == 0 )                    // we are in CHILD process
156            {
157                // CHILD process exec process KSH
[444]158                ret_exec = execve( "/bin/user/ksh.elf" , NULL , NULL ); 
[436]159
160                if ( ret_exec )   // error in exec             
161                {
162                    // CHILD display error message on TXT0 terminal
[440]163                    snprintf( string , 64 , "[INIT ERROR] CHILD cannot exec KSH" );
[436]164                    display_string( string );
165                }
166            }
167            else                                       // we are in INIT process
168            {
[442]169                // INIT display new KSH process PID
170                snprintf( string , 64 , "[INIT] re-created KSH / pid = %x", ret_fork ); 
[436]171                display_string( string );
172            }
[438]173        } // end KSH kill handling
[427]174
[442]175#if DEBUG_PROCESS_INIT
[438]176
[440]177        // INIT displays processes and threads in all clusters
178        for( x = 0 ; x < x_size ; x++ )
179        {
180            for( y = 0 ; y < y_size ; y++ )
181            {
182                cxy = CXY_FROM_XY( x , y );
183                display_cluster_processes( cxy );
184                for( lid = 0 ; lid < ncores ; lid++ )
185                { 
186                    display_sched( cxy , lid );
187                }
188            }
189        }
[438]190
[440]191#endif
192
[438]193    }  // end while waiting KSH[i] termination
194
[427]195} // end main()
196
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