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Perform blas_thread_shutdown with pthread_atfork() on Cygwin 

Even if we're directly using the win32 threading driver and not pthreads,
pthread_atfork still works fine to register a pre-fork handler, and is
necessary to restore the threading server to a pre-initialized state.
This commit is contained in:
Erik M. Bray 2018-02-06 11:10:45 +01:00
parent ce2028b425
commit f5fc109fbd
2 changed files with 20 additions and 2 deletions
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20
driver/others/blas_server_win32.c
View File

@ -40,6 +40,14 @@
#include <stdlib.h>
#include "common.h"
#if defined(OS_CYGWIN_NT) && !defined(unlikely)
#ifdef __GNUC__
#define unlikely(x) __builtin_expect(!!(x), 0)
#else
#define unlikely(x) (x)
#endif
#endif
/* This is a thread implementation for Win32 lazy implementation */
/* Thread server common infomation */
@ -53,7 +61,7 @@ typedef struct{
} blas_pool_t;
/* We need this grobal for cheking if initialization is finished. */
/* We need this global for cheking if initialization is finished. */
int blas_server_avail = 0;
/* Local Variables */
@ -340,6 +348,11 @@ int blas_thread_init(void){
int exec_blas_async(BLASLONG pos, blas_queue_t *queue){
#if defined(SMP_SERVER) && defined(OS_CYGWIN_NT)
// Handle lazy re-init of the thread-pool after a POSIX fork
if (unlikely(blas_server_avail == 0)) blas_thread_init();
#endif
blas_queue_t *current;
current = queue;
@ -405,6 +418,11 @@ int exec_blas_async_wait(BLASLONG num, blas_queue_t *queue){
/* Execute Threads */
int exec_blas(BLASLONG num, blas_queue_t *queue){
#if defined(SMP_SERVER) && defined(OS_CYGWIN_NT)
// Handle lazy re-init of the thread-pool after a POSIX fork
if (unlikely(blas_server_avail == 0)) blas_thread_init();
#endif
#ifndef ALL_THREADED
int (*routine)(blas_arg_t *, void *, void *, double *, double *, BLASLONG);
#endif

2
driver/others/memory.c
View File

@ -323,7 +323,7 @@ void openblas_fork_handler()
// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60035
// In the mean time build with USE_OPENMP=0 or link against another
// implementation of OpenMP.
#if !(defined(OS_WINDOWS) || defined(OS_ANDROID)) && defined(SMP_SERVER)
#if !((defined(OS_WINDOWS) && !defined(OS_CYGWIN_NT)) || defined(OS_ANDROID)) && defined(SMP_SERVER)
int err;
err = pthread_atfork ((void (*)(void)) BLASFUNC(blas_thread_shutdown), NULL, NULL);
if(err != 0)