hello,

Chen i use flocks on Linux, it is always possible to write or read the locked file.

Script:

<?php
$fp = fopen ( 'lock.tmp', 'a+');

if( flock ( $fp, LOCK_EX ) ) {
  fwrite ( STDOUT, "Lock good...\n");
} else {
  fwrite ( STDOUT, "Error getting Lock...\n");
}

sleep ( 30 );

if( flock ( $fp, LOCK_UN ) ) {
  fwrite ( STDOUT, "Lock release good...\n");
} else {
  fwrite ( STDOUT, "Error released Lock...\n");
}

?>


during sleep, i run "echo test >> lock.tmp" under shell. 
And it is works fine.

On windows 2000, it is seems to works.