main.cpp File Reference

contains all functions to demo thread synch More...

#include <iostream>
#include <thread>
#include <mutex>
#include <chrono>
#include <condition_variable>
#include <random>
#include "LockGuard.h"

Include dependency graph for main.cpp:

Go to the source code of this file.

Macros
#define	NUM_THDS   3

Functions
void	debugPrinter (int id, std::string msg)
	DEBUG PRINTER function. More...
void	debugPrinter (int id, int next_thd)
void	debugPrinter (int id, std::string msg, int next_thd)
void	thd_printer (int id, std::string msg)
	thread print function More...
void	thd_worker (const int id, int &next_thd, std::default_random_engine &rand_e)
	thread worker function More...
int	main ()

Variables
std::mutex	mtx
std::mutex	prnt_mtx
std::condition_variable	cond
bool	DEBUG = false

Detailed Description

contains all functions to demo thread synch

Note

set DEBUG to true in globals to turn on debug output file-wide, or uncomment it inside a function to enable function-specific debug output.

needs to be compiled with flag -pthread.

Author

Armaan Roshani

Definition in file main.cpp.

Macro Definition Documentation

NUM_THDS

#define NUM_THDS   3

Definition at line 25 of file main.cpp.

Function Documentation

debugPrinter() [1/3]

void debugPrinter	(	int	id,
		std::string	msg
	)

DEBUG PRINTER function.

Parameters

id	an integer that defines thread number (0 for main)
msg	a string containing message to be printed

Prints to standard out

Warning

NOT thread-safe; must be called within a thread-safe scope

Definition at line 45 of file main.cpp.

debugPrinter() [2/3]

void debugPrinter	(	int	id,
		int	next_thd
	)

Definition at line 59 of file main.cpp.

debugPrinter() [3/3]

void debugPrinter	(	int	id,
		std::string	msg,
		int	next_thd
	)

Definition at line 74 of file main.cpp.

main()

int main

(

)

create an array of NUM_THDS thread objects

create a pseudo-random engine

wait for 3 seconds

Definition at line 180 of file main.cpp.

thd_printer()

void thd_printer	(	int	id,
		std::string	msg
	)

thread print function

Parameters

id	an integer that defines thread number
msg	a string containing message to be printed

Prints to standard out

Warning

NOT thread-safe; must be called within a thread-safe scope

Definition at line 91 of file main.cpp.

thd_worker()

void thd_worker	(	const int	id,
		int &	next_thd,
		std::default_random_engine &	rand_e
	)

thread worker function

Parameters

id	an integer passed by val defining current thread number
next_thd	an integer passed by ref that keeps track of thread order
rand_e	a pseudo-random number generator engine passed by ref

Upon startup, function blocks on condition_signal. Upon receipt of condition_signal, function sleeps at random for between 1 and 5 seconds, then signals next thread and goes back to blocking on condition_signal.

Definition at line 120 of file main.cpp.

Variable Documentation

cond

std::condition_variable cond

Definition at line 31 of file main.cpp.

DEBUG

bool DEBUG = false

Definition at line 32 of file main.cpp.

mtx

std::mutex mtx

Definition at line 29 of file main.cpp.

prnt_mtx

std::mutex prnt_mtx

Definition at line 30 of file main.cpp.