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Before threads, the normal way to achieve multiple instruction sequences (ie, doing several things at once, in parallel) was to use the fork() and exec() system calls to create several processes -- each being a single thread of execution.In the UNIX operating system, every process has the following: These resources are private to each process; for example, processes cannot peek into one another's address space, open and close files for one another, etc.Another possibility is that thread two would first increment When a mutex lock is attempted against a mutex which is held by another thread, the thread is blocked until the mutex is unlocked.When a thread terminates, the mutex does not unless explicitly unlocked. Man Pages: A join is performed when one wants to wait for a thread to finish.It is most effective on multi-processor or multi-core systems where the process flow can be scheduled to run on another processor thus gaining speed through parallel or distributed processing.Threads require less overhead than "forking" or spawning a new process because the system does not initialize a new system virtual memory space and environment for the process.The POSIX thread libraries are a standards based thread API for C/C .It allows one to spawn a new concurrent process flow.

The condition variable mechanism allows threads to suspend execution and relinquish the processor until some condition is true.

Any mutex can be used, there is no explicit link between the mutex and the condition variable. Covers ACE (ADAPTIVE Communication Environment) open-source framework view of threads and other topics.

Man pages of functions used in conjunction with the condition variable: pthread_mutex_t count_mutex = PTHREAD_MUTEX_INITIALIZER; pthread_cond_t condition_var = PTHREAD_COND_INITIALIZER; void *function Count1(); void *function Count2(); int count = 0; #define COUNT_DONE 10 #define COUNT_HALT1 3 #define COUNT_HALT2 6 main() // Write numbers 1-3 and 8-10 as permitted by function Count2() void *function Count1() // Write numbers 4-7 void *function Count2() Counter value function Count1: 1 Counter value function Count1: 2 Counter value function Count1: 3 Counter value function Count2: 4 Counter value function Count2: 5 Counter value function Count2: 6 Counter value function Count2: 7 Counter value function Count1: 8 Counter value function Count1: 9 Counter value function Count1: 10 Final count: 10 will increment the count between the values COUNT_HALT1 and COUNT_HALT2. The logic conditions (the "if" and "while" statements) must be chosen to insure that the "signal" is executed if the "wait" is ever processed.

All threads within a process share the same address space.

A thread is spawned by defining a function and its arguments which will be processed in the thread.

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