lavc: add supports of OS/2 threads

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -94,6 +94,7 @@ Configuration options:
   --disable-avfilter       disable video filter support [no]
   --disable-pthreads       disable pthreads [auto]
   --disable-w32threads     disable Win32 threads [auto]
+  --disable-os2threads     disable OS/2 threads [auto]
   --enable-x11grab         enable X11 grabbing [no]
   --disable-network        disable network support [no]
   --enable-gray            enable full grayscale support (slower color)
@@ -1069,6 +1070,7 @@ CONFIG_LIST="
 THREADS_LIST='
     pthreads
     w32threads
+    os2threads
 '
 
 ARCH_LIST='
@@ -2656,6 +2658,7 @@ case $target_os in
           emximp -o $(SUBDIR)$(LIBPREF)$(NAME)_dll.lib $(SUBDIR)$(NAME).def;'
         SLIB_INSTALL_EXTRA_LIB='$(LIBPREF)$(NAME)_dll.a $(LIBPREF)$(NAME)_dll.lib'
         enable dos_paths
+        enable_weak os2threads
         ;;
     gnu/kfreebsd)
         add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -D_BSD_SOURCE
@@ -2995,7 +2998,7 @@ fi
 
 # check for some common methods of building with pthread support
 # do this before the optional library checks as some of them require pthreads
-if ! disabled pthreads && ! enabled w32threads; then
+if ! disabled pthreads && ! enabled w32threads && ! enabled os2threads; then
     enable pthreads
     if check_func pthread_create; then
         :

libavcodec/Makefile

@@ -688,6 +688,7 @@ OBJS-$(CONFIG_TEXT2MOVSUB_BSF)            += movsub_bsf.o
 # thread libraries
 OBJS-$(HAVE_PTHREADS)                  += pthread.o
 OBJS-$(HAVE_W32THREADS)                += pthread.o
+OBJS-$(HAVE_OS2THREADS)                += pthread.o
 
 OBJS-$(CONFIG_MLIB)                    += mlib/dsputil_mlib.o           \
 

libavcodec/os2threads.h

@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2011 KO Myung-Hun <komh@chollian.net>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * os2threads to pthreads wrapper
+ */
+
+#ifndef AVCODEC_OS2PTHREADS_H
+#define AVCODEC_OS2PTHREADS_H
+
+#define INCL_DOS
+#include <os2.h>
+
+#undef __STRICT_ANSI__          /* for _beginthread() */
+#include <stdlib.h>
+
+typedef TID  pthread_t;
+typedef void pthread_attr_t;
+
+typedef HMTX pthread_mutex_t;
+typedef void pthread_mutexattr_t;
+
+typedef struct {
+    HEV  event_sem;
+    int  wait_count;
+} pthread_cond_t;
+
+typedef void pthread_condattr_t;
+
+struct thread_arg {
+    void *(*start_routine)(void *);
+    void *arg;
+};
+
+static void thread_entry(void *arg)
+{
+    struct thread_arg *thread_arg = arg;
+
+    thread_arg->start_routine(thread_arg->arg);
+
+    av_free(thread_arg);
+}
+
+static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void*), void *arg)
+{
+    struct thread_arg *thread_arg;
+
+    thread_arg = av_mallocz(sizeof(struct thread_arg));
+
+    thread_arg->start_routine = start_routine;
+    thread_arg->arg = arg;
+
+    *thread = _beginthread(thread_entry, NULL, 256 * 1024, thread_arg);
+
+    return 0;
+}
+
+static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
+{
+    DosWaitThread((PTID)&thread, DCWW_WAIT);
+
+    return 0;
+}
+
+static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
+{
+    DosCreateMutexSem(NULL, (PHMTX)mutex, 0, FALSE);
+
+    return 0;
+}
+
+static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
+{
+    DosCloseMutexSem(*(PHMTX)mutex);
+
+    return 0;
+}
+
+static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
+{
+    DosRequestMutexSem(*(PHMTX)mutex, SEM_INDEFINITE_WAIT);
+
+    return 0;
+}
+
+static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
+{
+    DosReleaseMutexSem(*(PHMTX)mutex);
+
+    return 0;
+}
+
+static av_always_inline int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
+{
+    DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
+
+    cond->wait_count = 0;
+
+    return 0;
+}
+
+static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
+{
+    DosCloseEventSem(cond->event_sem);
+
+    return 0;
+}
+
+static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
+{
+    if (cond->wait_count > 0) {
+        DosPostEventSem(cond->event_sem);
+
+        cond->wait_count--;
+    }
+
+    return 0;
+}
+
+static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
+{
+    while (cond->wait_count > 0) {
+        DosPostEventSem(cond->event_sem);
+
+        cond->wait_count--;
+    }
+
+    return 0;
+}
+
+static av_always_inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
+{
+    cond->wait_count++;
+
+    pthread_mutex_unlock(mutex);
+
+    DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
+
+    pthread_mutex_lock(mutex);
+
+    return 0;
+}
+
+#endif /* AVCODEC_OS2PTHREADS_H */

libavcodec/pthread.c

@@ -38,6 +38,8 @@
 #include <pthread.h>
 #elif HAVE_W32THREADS
 #include "w32pthreads.h"
+#elif HAVE_OS2THREADS
+#include "os2threads.h"
 #endif
 
 typedef int (action_func)(AVCodecContext *c, void *arg);