\n"; $fl_name = './flock.dat'; if(($fn1=fopen($fl_name,'c+'))!==false){ if(($fn4=fopen($fl_name,'r+'))===false) exit('open error'); flock($fn1,LOCK_EX,$rc); echo "flock1 rc = $rc
\n"; if(($fn5=fopen($fl_name,'r+'))===false) exit('open error'); if(($fn2=fopen($fl_name,'r+'))===false) exit('open error'); if(flock($fn2,LOCK_EX | LOCK_NB,$rc)===false){ echo "lock2 error $rc
\n"; } fclose($fn2); if(($fn2=fopen($fl_name,'r+'))===false) exit('open error'); if(flock($fn2,LOCK_EX | LOCK_NB,$rc)===false){ echo "lock2 error2 $rc
\n"; }else{ echo "lock2 success $rc
\n"; } fclose($fn2); fclose($fn1); if(flock($fn5,LOCK_EX | LOCK_NB,$rc)===false){ echo "lock5 error ?? $rc
\n"; }else{ echo "lock5 success @@ $rc
\n"; } fclose($fn5); if(flock($fn4,LOCK_EX | LOCK_NB,$rc)===false){ echo "lock4 error ?? $rc
\n"; }else{ echo "lock4 success @@ $rc
\n"; } fclose($fn4); if(($fn3=fopen($fl_name,'r+'))===false) exit('open error'); if(flock($fn3,LOCK_EX | LOCK_NB,$rc)===false){ echo "lock3 error ?? $rc
\n"; }else{ echo "lock3 success @@ $rc
\n"; } fclose($fn3); if(($fn1=fopen($fl_name,'r+'))===false) exit('open error'); if(flock($fn1,LOCK_EX | LOCK_NB,$rc)===false){ echo "lock1 error2 ?? $rc
\n"; }else{ echo "lock1 success @@ $rc
\n"; } fclose($fn1); } ?>