nginx 0.8.35 *) Change: now the charset filter runs before the SSI filter. *) Feature: the "chunked_transfer_encoding" directive. *) Bugfix: an "&" character was not escaped when it was copied in arguments part in a rewrite rule. *) Bugfix: nginx might be terminated abnormally while a signal processing or if the directive "timer_resolution" was used on platforms which do not support kqueue or eventport notification methods. Thanks to George Xie and Maxim Dounin. *) Bugfix: if temporary files and permanent storage area resided at different file systems, then permanent file modification times were incorrect. Thanks to Maxim Dounin. *) Bugfix: ngx_http_memcached_module might issue the error message "memcached sent invalid trailer". Thanks to Maxim Dounin. *) Bugfix: nginx could not built zlib-1.2.4 library using the library sources. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault occurred in a worker process, if there was large stderr output before FastCGI response; the bug had appeared in 0.8.34. Thanks to Maxim Dounin.

/*
 * Copyright (C) Igor Sysoev
 */


#include <ngx_config.h>
#include <ngx_core.h>


void
ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin)
{

#if (NGX_HAVE_ATOMIC_OPS)

    ngx_uint_t  i, n;

    for ( ;; ) {

        if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) {
            return;
        }

        if (ngx_ncpu > 1) {

            for (n = 1; n < spin; n <<= 1) {

                for (i = 0; i < n; i++) {
                    ngx_cpu_pause();
                }

                if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) {
                    return;
                }
            }
        }

        ngx_sched_yield();
    }

#else

#if (NGX_THREADS)

#error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !

#endif

#endif

}