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#include <stdint.h>
#include <string.h>
#include "ipc.h"
#include "pa2345.h"
#include "lamport.h"
#include "dist.h"
#define MAX_LOOP_STR 1024
void child_phase0( dist_info_t *info, uint8_t id ) {
lamport_init( &gl_lamport_time );
close_redundant_pipes( info, id );
}
void child_phase1( dist_info_t *info, uint8_t id ) {
pid_t child_pid = getpid();
char buf[MAX_MESSAGE_LEN];
uint8_t i;
my_info_t me = {
.id = id,
.dist_info = info
};
int size = snprintf( buf, sizeof(buf), log_started_fmt, get_lamport_time(),
id, child_pid,
info->parent_pid,
0 );
fputs( buf, info->events_log );
fflush( info->events_log );
fputs( buf, stdout );
lamport_increase( &gl_lamport_time );
Message msg = {
.s_header = {
.s_magic = MESSAGE_MAGIC,
.s_payload_len = size + 1,
.s_type = STARTED,
.s_local_time = get_lamport_time()
}
};
strncpy( msg.s_payload, buf, sizeof( msg.s_payload ) );
send_multicast( &me, &msg );
for( i = 1; i <= info->x; i++ ) {
if( i == me.id )
continue;
if( !receive( &me, i, &msg ) ) {
lamport_message_handler( &gl_lamport_time, msg.s_header.s_local_time );
if( msg.s_header.s_type != STARTED ) {
fprintf( stderr, "Message type INVALID (not STARTED)!\n" );
break;
}
}
}
snprintf( buf, sizeof(buf), log_received_all_started_fmt, get_lamport_time(), id );
fputs( buf, info->events_log );
fflush( info->events_log );
fputs( buf, stdout );
fflush( info->events_log );
}
void child_phase2( dist_info_t *info, uint8_t id ) {
my_info_t me = {
.id = id,
.dist_info = info
};
if( info->mutex )
request_cs(&me);
uint8_t i, loop_cnt;
char buf[ MAX_LOOP_STR ];
loop_cnt = id * 5;
for( i = 1; i <= loop_cnt; i++ ) {
snprintf( buf, sizeof(buf), log_loop_operation_fmt, id, i, loop_cnt );
print( buf );
}
if( info->mutex )
release_cs( &me );
}
void child_phase3( dist_info_t *info, uint8_t id ) {
char buf[MAX_MESSAGE_LEN];
my_info_t me = {
.id = id,
.dist_info = info
};
int size = snprintf( buf, sizeof(buf), log_done_fmt,
get_lamport_time(), id,
0 );
fputs( buf, info->events_log );
fflush( info->events_log );
fputs( buf, stdout );
lamport_increase( &gl_lamport_time );
Message msg = {
.s_header = {
.s_magic = MESSAGE_MAGIC,
.s_payload_len = size + 1,
.s_type = DONE,
.s_local_time = get_lamport_time()
}
};
strncpy( msg.s_payload, buf, sizeof( msg.s_payload ) );
send_multicast( &me, &msg );
info->workers--;
while( info->workers ) {
if( !receive_any( &me, &msg ) ) {
lamport_message_handler( &gl_lamport_time, msg.s_header.s_local_time );
if( msg.s_header.s_type == DONE )
info->workers--;
}
}
snprintf( buf, sizeof(buf), log_received_all_done_fmt,
get_lamport_time(), id );
fputs( buf, info->events_log );
fflush( info->events_log );
fputs( buf, stdout );
}
void child_workflow( dist_info_t *info, uint8_t id ) {
/* CHILD PHASE 0: Close all redundant descriptors */
child_phase0(info, id);
/* CHILD PHASE 1: Send STARTED message for all, receive STARTED
* messages from other childs */
child_phase1(info, id);
/* CHILD PHASE 2: Do some useful work */
child_phase2(info, id);
/* CHILD PHASE 3: Send DONE message for all, receive DONE messages from
* other childs and exit */
child_phase3(info, id);
}
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