usleep           2675 ext/pdo_sqlite/sqlite/src/os_unix.c   usleep(ms*1000);
usleep           1680 ext/sqlite/libsqlite/src/os.c   usleep(ms*1000);
usleep           3109 ext/standard/basic_functions.c 	PHP_FE(usleep,															arginfo_usleep)
usleep           4794 ext/standard/basic_functions.c 	usleep(num);
usleep             67 ext/standard/uniqid.c 		usleep(1);
usleep              3 win32/unistd.h void usleep(unsigned int useconds);