The system_flock function locks the specified file against interference from other processes. Use system_flock if you do not want other processes to use the file you currently have open. Overusing file locking can cause performance degradation and possibly lead to deadlocks.
int system_flock(SYS_FILE fd);
The constant IO_OKAY if the lock succeeds, or the constant IO_ERROR if the lock fails.
SYS_FILE fd is the platform-independent file descriptor.
system_errmsg() Function, system_fopenRO() Function, system_fopenRW() Function, system_fopenWA() Function, system_lseek() Function, system_fread() Function, system_fwrite() Function, system_fwrite_atomic() Function, system_ulock() Function, system_fclose() Function