Remove last bit of GNU pth thread

PEP 11:
  Name: Systems using --with-pth (GNU pth threads)
  Unsupported in: Python 3.2
  Code removed in: Python 3.3

Python/thread_pth.h

-
-/* GNU pth threads interface
-   http://www.gnu.org/software/pth
-   2000-05-03 Andy Dustman <andy@dustman.net>
-
-   Adapted from Posix threads interface
-   12 May 1997 -- david arnold <davida@pobox.com>
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <pth.h>
-
-/* A pth mutex isn't sufficient to model the Python lock type
- * because pth mutexes can be acquired multiple times by the
- * same thread.
- *
- * The pth_lock struct implements a Python lock as a "locked?" bit
- * and a <condition, mutex> pair.  In general, if the bit can be acquired
- * instantly, it is, else the pair is used to block the thread until the
- * bit is cleared.
- */
-
-typedef struct {
-    char             locked; /* 0=unlocked, 1=locked */
-    /* a <cond, mutex> pair to handle an acquire of a locked lock */
-    pth_cond_t   lock_released;
-    pth_mutex_t  mut;
-} pth_lock;
-
-#define CHECK_STATUS(name)  if (status == -1) { printf("%d ", status); perror(name); error = 1; }
-
-pth_attr_t PyThread_attr;
-
-/*
- * Initialization.
- */
-
-static void PyThread__init_thread(void)
-{
-    pth_init();
-    PyThread_attr = pth_attr_new();
-    pth_attr_set(PyThread_attr, PTH_ATTR_STACK_SIZE, 1<<18);
-    pth_attr_set(PyThread_attr, PTH_ATTR_JOINABLE, FALSE);
-}
-
-/*
- * Thread support.
- */
-
-
-long PyThread_start_new_thread(void (*func)(void *), void *arg)
-{
-    pth_t th;
-    dprintf(("PyThread_start_new_thread called\n"));
-    if (!initialized)
-        PyThread_init_thread();
-
-    th = pth_spawn(PyThread_attr,
-                             (void* (*)(void *))func,
-                             (void *)arg
-                             );
-
-    return th;
-}
-
-long PyThread_get_thread_ident(void)
-{
-    volatile pth_t threadid;
-    if (!initialized)
-        PyThread_init_thread();
-    threadid = pth_self();
-    return (long) threadid;
-}
-
-void PyThread_exit_thread(void)
-{
-    dprintf(("PyThread_exit_thread called\n"));
-    if (!initialized) {
-        exit(0);
-    }
-}
-
-/*
- * Lock support.
- */
-PyThread_type_lock PyThread_allocate_lock(void)
-{
-    pth_lock *lock;
-    int status, error = 0;
-
-    dprintf(("PyThread_allocate_lock called\n"));
-    if (!initialized)
-        PyThread_init_thread();
-
-    lock = (pth_lock *) malloc(sizeof(pth_lock));
-    memset((void *)lock, '\0', sizeof(pth_lock));
-    if (lock) {
-        lock->locked = 0;
-        status = pth_mutex_init(&lock->mut);
-        CHECK_STATUS("pth_mutex_init");
-        status = pth_cond_init(&lock->lock_released);
-        CHECK_STATUS("pth_cond_init");
-        if (error) {
-            free((void *)lock);
-            lock = NULL;
-        }
-    }
-    dprintf(("PyThread_allocate_lock() -> %p\n", lock));
-    return (PyThread_type_lock) lock;
-}
-
-void PyThread_free_lock(PyThread_type_lock lock)
-{
-    pth_lock *thelock = (pth_lock *)lock;
-
-    dprintf(("PyThread_free_lock(%p) called\n", lock));
-
-    free((void *)thelock);
-}
-
-int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
-{
-    int success;
-    pth_lock *thelock = (pth_lock *)lock;
-    int status, error = 0;
-
-    dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
-
-    status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
-    CHECK_STATUS("pth_mutex_acquire[1]");
-    success = thelock->locked == 0;
-    if (success) thelock->locked = 1;
-    status = pth_mutex_release( &thelock->mut );
-    CHECK_STATUS("pth_mutex_release[1]");
-
-    if ( !success && waitflag ) {
-        /* continue trying until we get the lock */
-
-        /* mut must be locked by me -- part of the condition
-         * protocol */
-        status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
-        CHECK_STATUS("pth_mutex_acquire[2]");
-        while ( thelock->locked ) {
-            status = pth_cond_await(&thelock->lock_released,
-                                    &thelock->mut, NULL);
-            CHECK_STATUS("pth_cond_await");
-        }
-        thelock->locked = 1;
-        status = pth_mutex_release( &thelock->mut );
-        CHECK_STATUS("pth_mutex_release[2]");
-        success = 1;
-    }
-    if (error) success = 0;
-    dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
-    return success;
-}
-
-void PyThread_release_lock(PyThread_type_lock lock)
-{
-    pth_lock *thelock = (pth_lock *)lock;
-    int status, error = 0;
-
-    dprintf(("PyThread_release_lock(%p) called\n", lock));
-
-    status = pth_mutex_acquire( &thelock->mut, 0, NULL );
-    CHECK_STATUS("pth_mutex_acquire[3]");
-
-    thelock->locked = 0;
-
-    status = pth_mutex_release( &thelock->mut );
-    CHECK_STATUS("pth_mutex_release[3]");
-
-    /* wake up someone (anyone, if any) waiting on the lock */
-    status = pth_cond_notify( &thelock->lock_released, 0 );
-    CHECK_STATUS("pth_cond_notify");
-}