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103 lines
2.3 KiB
103 lines
2.3 KiB
#ifndef SFRT_SOFTWARE_INTERRUPT_H
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#define SFRT_SOFTWARE_INTERRUPT_H
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#include <stdbool.h>
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#include <assert.h>
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#include <signal.h>
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/***************************************
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* Externs
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***************************************/
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extern __thread volatile sig_atomic_t software_interrupt__is_disabled;
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/***************************************
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* Public Static Inlines
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***************************************/
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static inline void
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software_interrupt__disable(void)
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{
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while (__sync_bool_compare_and_swap(&software_interrupt__is_disabled, 0, 1) == false)
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;
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}
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/**
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* Enables signals
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*/
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static inline void
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software_interrupt__enable(void)
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{
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if (__sync_bool_compare_and_swap(&software_interrupt__is_disabled, 1, 0) == false) assert(0);
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}
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/**
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* @returns boolean if signals are enabled
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*/
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static inline int
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software_interrupt__is_enabled(void)
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{
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return (software_interrupt__is_disabled == 0);
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}
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/**
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* Masks a signal on the current thread
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* @param signal - the signal you want to mask
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* @return 0 on success. Exits program otherwise
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**/
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static inline int
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software_interrupt__mask_signal(int signal)
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{
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sigset_t set;
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int return_code;
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assert(signal == SIGALRM || signal == SIGUSR1);
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/* all threads created by the calling thread will have signal blocked */
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sigemptyset(&set);
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sigaddset(&set, signal);
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return_code = pthread_sigmask(SIG_BLOCK, &set, NULL);
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if (return_code != 0) {
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errno = return_code;
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perror("pthread_sigmask");
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exit(-1);
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}
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return 0;
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}
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/**
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* Unmasks a signal on the current thread
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* @param signal - the signal you want to unmask
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* @return 0 on success. Exits program otherwise
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**/
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static inline int
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software_interrupt__unmask_signal(int signal)
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{
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sigset_t set;
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int return_code;
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assert(signal == SIGALRM || signal == SIGUSR1);
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/* all threads created by the calling thread will have signal unblocked */
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sigemptyset(&set);
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sigaddset(&set, signal);
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return_code = pthread_sigmask(SIG_UNBLOCK, &set, NULL);
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if (return_code != 0) {
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errno = return_code;
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perror("pthread_sigmask");
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exit(-1);
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}
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return 0;
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}
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/***************************************
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* Exports from module.c
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***************************************/
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void software_interrupt__initialize(void);
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void software_interrupt__arm_timer(void);
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void software_interrupt__disarm_timer(void);
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#endif /* SFRT_SOFTWARE_INTERRUPT_H */
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