Linux Kernel Barrier

Linux kernel extension that provides a synchronization system based on a barrier with 32 levels of synchronization. Threads/processes can go to sleep on the barrier and are awaken when the awake system call is invoked.

Installation

Copy the barrier/ folder within the kernel source code and compile it.

See the test client for how to use the new system calls once the kernel is in use.

System calls

• int sys_get_barrier (key_t key, int flags): installs a new barrier with specified flags and returns its barrier descriptor
• int sys_release_barrier (int bd): uninstalls the barrier with the given descriptor
• int sys_sleep_on_barrier (int bd, int tag): puts the calling process to sleep on a barrier on the given tag (level)
• int sys_awake_barrier (int bd, int tag): awakes all processing sleeping on the barrier on the given tag (level)