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drivers/tty/tty_mutex.c
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#include <linux/tty.h> #include <linux/module.h> #include <linux/kallsyms.h> #include <linux/semaphore.h> #include <linux/sched.h> /* * The 'big tty mutex' * * This mutex is taken and released by tty_lock() and tty_unlock(), * replacing the older big kernel lock. * It can no longer be taken recursively, and does not get * released implicitly while sleeping. * * Don't use in new code. */ static DEFINE_MUTEX(big_tty_mutex); |
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/* * Getting the big tty mutex. */ void __lockfunc tty_lock(void) { |
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mutex_lock(&big_tty_mutex); |
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} EXPORT_SYMBOL(tty_lock); void __lockfunc tty_unlock(void) { |
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mutex_unlock(&big_tty_mutex); } EXPORT_SYMBOL(tty_unlock); |