Changes between Version 42 and Version 43 of kernel_syscalls

Timestamp:

Sep 16, 2015, 5:43:53 PM (10 years ago)

Author:

alain

Comment:

--

kernel_syscalls

@@ -81 +81 @@
 It test the _tty_rx_full[tty_id] variable, read the _tty_rx_buf[tty_id] buffer, writes this character to the target buffer, and resets the_tty_rx_full[tty_id] register. The length argument is not used.
 Returns -1 if no TTY terminal allocated to the calling task. Returns  the number of characters that have been read if a terminal is allocated (can be 0 or 1).
-
-=== 4) int '''_sys_tty_get_lock'''( unsigned int  channel,   unsigned int* save_sr_ptr ) ===
-This blocking function try to take the lock protecting exclusive access to TTY terminal identified by the "channel" argument. It enters a critical section before taking the lock, and save the SR value at address defined by the ''save_sr_ptr'' argument. Returns -1 if no TTY terminal allocated to the calling task. If a TTY terminal is allocated, it returns only when the lock has been successfully taken.
-
-=== 5) int '''_sys_tty_release_lock'''( unsigned int  channel,  unsigned int* save_sr_ptr ) ===
-This function releases the lock protecting exclusive access to TTY terminal identified by the ''channel'' argument.
-It exit the critical section after lock release, and restore SR value from address defined by the ''save_sr_ptr'' argument. Returns -1 if no TTY terminal allocated to the calling task.