C++ Pthreads Programs for synchronization problems and solutions
Simple examples that show how to use the pthreads library in C/C++. Use
make
to compile all the code using the supplied Makefile. Use
make clean
to remove object files and
make realclean
to remove object files and compiled programs.
The file example.cc shows a basic example of how to create a set of
threads to do some computation and then wait for them to finish. Each
thread sleeps a random period of time and then prints out a short
message.
Caution: This code does not use any synchronizaiton, so the print statements from each thread may be jumbled. See subsequent code for how to do this properly.
The file problem.cc shows a basic problem that exists when threads
share memory but are not synchronized. Each time you run this code,
the threads should count to a total of 200, but they have different
answer each time.
The file semaphore.cc shows how to use a semaphore to synchronize
access to shared memory.
The file mutex.cc shows how to use a mutex to synchronize access to
shared memory.