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111 lines
2.5 KiB
111 lines
2.5 KiB
#pragma once
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#include <assert.h>
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#include <errno.h>
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#include <panic.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define SOFTWARE_INTERRUPT_TIME_TO_START_IN_USEC (10 * 1000) /* 10 ms */
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#define SOFTWARE_INTERRUPT_INTERVAL_DURATION_IN_USEC (5 * 1000) /* 5 ms */
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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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extern uint64_t software_interrupt_interval_duration_in_cycles;
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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) {
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panic("Recursive call to software_interrupt_enable\n");
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}
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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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