POSIX Threads

POSIX Threads, usually referred to as pthreads, is an execution model that exists independently from a language, as well as a parallel execution model. It allows a program to control multiple different flows of work that overlap in time. Each flow of work is referred to as a thread, and creation and control over these flows is achieved by making calls to the POSIX Threads API. POSIX Threads is an API defined by the standard POSIX.1c, Threads extensions (IEEE Std 1003.1c-1995).

Implementations of the API are available on many Unix-like POSIX-conformant operating systems such as FreeBSD, NetBSD, OpenBSD, Linux, macOS, Android[1], Solaris, Redox, and AUTOSAR Adaptive, typically bundled as a library libpthread. DR-DOS and Microsoft Windows implementations also exist: within the SFU/SUA subsystem which provides a native implementation of a number of POSIX APIs, and also within third-party packages such as pthreads-w32,[2] which implements pthreads on top of existing Windows API.

Contents

pthreads defines a set of C programming language types, functions and constants. It is implemented with a pthread.h header and a thread library.

There are around 100 threads procedures, all prefixed pthread_ and they can be categorized into four groups:

  • Thread management - creating, joining threads etc.
  • Mutexes
  • Condition variables
  • Synchronization between threads using read/write locks and barriers

The POSIX semaphore API works with POSIX threads but is not part of threads standard, having been defined in the POSIX.1b, Real-time extensions (IEEE Std 1003.1b-1993) standard. Consequently, the semaphore procedures are prefixed by sem_ instead of pthread_.

Example

An example illustrating the use of pthreads in C:

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <pthread.h>
#include <unistd.h>

#define NUM_THREADS 5

void *perform_work(void *arguments){
  int index = *((int *)arguments);
  int sleep_time = 1 + rand() % NUM_THREADS;
  printf("THREAD %d: Started.\n", index);
  printf("THREAD %d: Will be sleeping for %d seconds.\n", index, sleep_time);
  sleep(sleep_time);
  printf("THREAD %d: Ended.\n", index);
  
}

int main(void) {
  pthread_t threads[NUM_THREADS];
  int thread_args[NUM_THREADS];
  int i;
  int result_code;
  
  //create all threads one by one
  for (i = 0; i < NUM_THREADS; i++) {
    printf("IN MAIN: Creating thread %d.\n", i);
    thread_args[i] = i;
    result_code = pthread_create(&threads[i], NULL, perform_work, &thread_args[i]);
    assert(!result_code);
  }

  printf("IN MAIN: All threads are created.\n");

  //wait for each thread to complete
  for (i = 0; i < NUM_THREADS; i++) {
    result_code = pthread_join(threads[i], NULL);
    assert(!result_code);
    printf("IN MAIN: Thread %d has ended.\n", i);
  }

  printf("MAIN program has ended.\n");
  return 0;
}

This program creates five threads, each executing the function perform_work that prints the unique number of this thread to standard output. If a programmer wanted the threads to communicate with each other, this would require defining a variable outside of the scope of any of the functions, making it a global variable. This program can be compiled using the gcc compiler with the following command:

gcc pthreads_demo.c -lpthread -o pthreads_demo

Here is one of the many possible outputs from running this program.

IN MAIN: Creating thread 0.
IN MAIN: Creating thread 1.
IN MAIN: Creating thread 2.
IN MAIN: Creating thread 3.
THREAD 0: Started.
IN MAIN: Creating thread 4.
THREAD 3: Started.
THREAD 2: Started.
THREAD 0: Will be sleeping for 3 seconds.
THREAD 1: Started.
THREAD 1: Will be sleeping for 5 seconds.
THREAD 2: Will be sleeping for 4 seconds.
THREAD 4: Started.
THREAD 4: Will be sleeping for 1 seconds.
IN MAIN: All threads are created.
THREAD 3: Will be sleeping for 4 seconds.
THREAD 4: Ended.
THREAD 0: Ended.
IN MAIN: Thread 0 has ended.
THREAD 2: Ended.
THREAD 3: Ended.
THREAD 1: Ended.
IN MAIN: Thread 1 has ended.
IN MAIN: Thread 2 has ended.
IN MAIN: Thread 3 has ended.
IN MAIN: Thread 4 has ended.
MAIN program has ended.

POSIX Threads for Windows

Windows does not support the pthreads standard natively, therefore the Pthreads-w32 project seeks to provide a portable and open-source wrapper implementation. It can also be used to port Unix software (which uses pthreads) with little or no modification to the Windows platform.[3] With some additional patches the last version 2.8.0 is compatible with 64-bit Windows systems.[4][5][6] 2.9.0 is said to also be 64-bit compatible.[7]

The mingw-w64 project also contains a wrapper implementation of pthreads, winpthreads,[8] which tries to use more native system calls than the Pthreads-w32 project.[9]

Interix environment subsystem available in the Windows Services for UNIX/Subsystem for UNIX-based Applications package provides a native port of the pthreads API, i.e. not mapped on Win32/Win64 API but built directly on the operating system syscall interface.[10]

gollark: > - be cross-platformNon-Linux OSes are for bees.
gollark: JAVA BAD
gollark: > - have a pretty graphical progress barUser-friendliness is for bees.
gollark: It's something. Though I do not like the rest of Go. Maybe it's okay for simple short scripts.
gollark: Tons of weird specialcasing.

See also

References
  1. "libc/bionic/pthread.c - platform/bionic - Git at Google". android.googlesource.com.
  2. "Pthread Win-32: Level of standards conformance". 2006-12-22. Retrieved 2010-08-29.
  3. Hart, Johnson M. (2004-11-21). "Experiments with the Open Source Pthreads Library and Some Comments". Archived from the original on 2010-08-30. Retrieved 2010-08-29.
  4. "pthread-win32_x64.zip Source and binary for pthreads-w32 v2.8.0". 2010-01-26. Retrieved 2010-08-29.
  5. "Forum discussion: pthreads-on-64bit-Windows". 2010-01-26. Archived from the original on 2010-12-15. Retrieved 2010-08-29.
  6. "Compile pthreads – mingw-w64". sourceforge.net. Archived from the original on 2012-07-02. Retrieved 2012-07-26.
  7. http://sourceware.org/pthreads-win32/news.html -- the "64 bit" mentions
  8. mingw-w64 - Revision 5520: /experimental/winpthreads
  9. see http://locklessinc.com/articles/pthreads_on_windows which is where it was originally derived from
  10. "Chapter 1: Introduction to Windows Services for UNIX 3.5".

Further reading
  • David R. Butenhof (1997). Programming with POSIX Threads. Addison-Wesley. ISBN 978-0-201-63392-4.
  • Bradford Nichols; Dick Buttlar; Jacqueline Proulx Farell (September 1996). Pthreads Programming. O'Reilly & Associates. ISBN 978-1-56592-115-3.
  • Charles J. Northrup (1996-01-25). Programming with UNIX Threads. John Wiley & Sons. ISBN 978-0-471-13751-1.
  • Kay A. Robbins & Steven Robbins (2003). UNIX Systems Programming. Prentice-Hall. ISBN 978-0-13-042411-2.
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