qemu: mutex/thread/cond wrappers and configure tweaks (Marcelo Tosatti)

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7237 c046a42c-6fe2-441c-8c8c-71466251a162

5 files changed, 243 insertions, 14 deletions

diff --git a/Makefile b/Makefile
index ed887de560..0f40cdac31 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,8 @@ else
 DOCS=
 endif
 
-LIBS+=$(AIOLIBS)
+LIBS+=$(PTHREADLIBS)
+LIBS+=$(CLOCKLIBS)
 
 ifdef CONFIG_SOLARIS
 LIBS+=-lsocket -lnsl -lresolv
@@ -170,6 +171,10 @@ ifdef CONFIG_COCOA
 OBJS+=cocoa.o
 endif
 
+ifdef CONFIG_IOTHREAD
+OBJS+=qemu-thread.o
+endif
+
 ifdef CONFIG_SLIRP
 CPPFLAGS+=-I$(SRC_PATH)/slirp
 SLIRP_OBJS=cksum.o if.o ip_icmp.o ip_input.o ip_output.o \
diff --git a/Makefile.target b/Makefile.target
index 21715873a3..82ada5a0e6 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -318,7 +318,8 @@ endif
 
 OBJS= main.o syscall.o strace.o mmap.o signal.o path.o thunk.o \
       elfload.o linuxload.o uaccess.o envlist.o
-LIBS+= $(AIOLIBS)
+LIBS+= $(PTHREADLIBS)
+LIBS+= $(CLOCKLIBS)
 ifdef TARGET_HAS_BFLT
 OBJS+= flatload.o
 endif
@@ -694,7 +695,8 @@ ifdef CONFIG_SLIRP
 CPPFLAGS+=-I$(SRC_PATH)/slirp
 endif
 
-LIBS+=$(AIOLIBS)
+LIBS+=$(PTHREADLIBS)
+LIBS+=$(CLOCKLIBS)
 # specific flags are needed for non soft mmu emulator
 ifdef CONFIG_STATIC
 LDFLAGS+=-static
diff --git a/configure b/configure
index b7b7b01d48..2f4ccfb407 100755
--- a/configure
+++ b/configure
@@ -181,7 +181,9 @@ bsd_user="no"
 build_docs="no"
 uname_release=""
 curses="yes"
+pthread="yes"
 aio="yes"
+io_thread="no"
 nptl="yes"
 mixemu="no"
 bluez="yes"
@@ -479,8 +481,12 @@ for opt do
   ;;
   --enable-mixemu) mixemu="yes"
   ;;
+  --disable-pthread) pthread="no"
+  ;;
   --disable-aio) aio="no"
   ;;
+  --enable-io-thread) io_thread="yes"
+  ;;
   --disable-blobs) blobs="no"
   ;;
   --kerneldir=*) kerneldir="$optarg"
@@ -611,7 +617,9 @@ echo "  --oss-lib                path to OSS library"
 echo "  --enable-uname-release=R Return R for uname -r in usermode emulation"
 echo "  --sparc_cpu=V            Build qemu for Sparc architecture v7, v8, v8plus, v8plusa, v9"
 echo "  --disable-vde            disable support for vde network"
+echo "  --disable-pthread        disable pthread support"
 echo "  --disable-aio            disable AIO support"
+echo "  --enable-io-thread       enable IO thread"
 echo "  --disable-blobs          disable installing provided firmware blobs"
 echo "  --kerneldir=PATH         look for kernel includes in PATH"
 echo ""
@@ -1123,21 +1131,26 @@ EOF
 fi
 
 ##########################################
-# AIO probe
-AIOLIBS=""
+# pthread probe
+PTHREADLIBS=""
 
-if test "$aio" = "yes" ; then
-  aio=no
-  cat > $TMPC << EOF
+if test "$pthread" = yes; then
+  pthread=no
+cat > $TMPC << EOF
 #include <pthread.h>
 int main(void) { pthread_mutex_t lock;  return 0; }
 EOF
-  if $cc $ARCH_CFLAGS -o $TMPE $AIOLIBS $TMPC 2> /dev/null ; then
-    aio=yes
-    AIOLIBS="-lpthread"
+  if $cc $ARCH_CFLAGS -o $TMPE $PTHREADLIBS $TMPC 2> /dev/null ; then
+    pthread=yes
+    PTHREADLIBS="-lpthread"
   fi
 fi
 
+if test "$pthread" = no; then
+   aio=no
+   io_thread=no
+fi
+
 ##########################################
 # iovec probe
 cat > $TMPC <<EOF
@@ -1231,6 +1244,7 @@ fi
 
 ##########################################
 # Do we need librt
+CLOCKLIBS=""
 cat > $TMPC <<EOF
 #include <signal.h>
 #include <time.h>
@@ -1245,8 +1259,7 @@ elif $cc $ARCH_CFLAGS -o $TMPE $TMPC -lrt > /dev/null 2> /dev/null ; then
 fi
 
 if test "$rt" = "yes" ; then
-  # Hack, we should have a general purpose LIBS for this sort of thing
-  AIOLIBS="$AIOLIBS -lrt"
+  CLOCKLIBS="-lrt"
 fi
 
 if test "$mingw32" = "yes" ; then
@@ -1324,6 +1337,7 @@ echo "uname -r          $uname_release"
 echo "NPTL support      $nptl"
 echo "vde support       $vde"
 echo "AIO support       $aio"
+echo "IO thread         $io_thread"
 echo "Install blobs     $blobs"
 echo "KVM support       $kvm"
 echo "fdt support       $fdt"
@@ -1376,7 +1390,8 @@ echo "ARCH_LDFLAGS=$ARCH_LDFLAGS" >> $config_mak
 echo "CFLAGS=$CFLAGS" >> $config_mak
 echo "LDFLAGS=$LDFLAGS" >> $config_mak
 echo "EXESUF=$EXESUF" >> $config_mak
-echo "AIOLIBS=$AIOLIBS" >> $config_mak
+echo "PTHREADLIBS=$PTHREADLIBS" >> $config_mak
+echo "CLOCKLIBS=$CLOCKLIBS" >> $config_mak
 case "$cpu" in
   i386)
     echo "ARCH=i386" >> $config_mak
@@ -1640,6 +1655,10 @@ if test "$aio" = "yes" ; then
   echo "#define CONFIG_AIO 1" >> $config_h
   echo "CONFIG_AIO=yes" >> $config_mak
 fi
+if test "$io_thread" = "yes" ; then
+  echo "CONFIG_IOTHREAD=yes" >> $config_mak
+  echo "#define CONFIG_IOTHREAD 1" >> $config_h
+fi
 if test "$blobs" = "yes" ; then
   echo "INSTALL_BLOBS=yes" >> $config_mak
 fi
diff --git a/qemu-thread.c b/qemu-thread.c
new file mode 100644
index 0000000000..719cfcddd4
--- /dev/null
+++ b/qemu-thread.c
@@ -0,0 +1,163 @@
+/*
+ * Wrappers around mutex/cond/thread functions
+ *
+ * Copyright Red Hat, Inc. 2009
+ *
+ * Author:
+ *  Marcelo Tosatti <mtosatti@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <time.h>
+#include <signal.h>
+#include <stdint.h>
+#include <string.h>
+#include "qemu-thread.h"
+
+static void error_exit(int err, const char *msg)
+{
+    fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err));
+    exit(1);
+}
+
+void qemu_mutex_init(QemuMutex *mutex)
+{
+    int err;
+
+    err = pthread_mutex_init(&mutex->lock, NULL);
+    if (err)
+        error_exit(err, __func__);
+}
+
+void qemu_mutex_lock(QemuMutex *mutex)
+{
+    int err;
+
+    err = pthread_mutex_lock(&mutex->lock);
+    if (err)
+        error_exit(err, __func__);
+}
+
+int qemu_mutex_trylock(QemuMutex *mutex)
+{
+    return pthread_mutex_trylock(&mutex->lock);
+}
+
+static void timespec_add_ms(struct timespec *ts, uint64_t msecs)
+{
+    ts->tv_sec = ts->tv_sec + (long)(msecs / 1000);
+    ts->tv_nsec = (ts->tv_nsec + ((long)msecs % 1000) * 1000000);
+    if (ts->tv_nsec >= 1000000000) {
+        ts->tv_nsec -= 1000000000;
+        ts->tv_sec++;
+    }
+}
+
+int qemu_mutex_timedlock(QemuMutex *mutex, uint64_t msecs)
+{
+    int err;
+    struct timespec ts;
+
+    clock_gettime(CLOCK_REALTIME, &ts);
+    timespec_add_ms(&ts, msecs);
+
+    err = pthread_mutex_timedlock(&mutex->lock, &ts);
+    if (err && err != ETIMEDOUT)
+        error_exit(err, __func__);
+    return err;
+}
+
+void qemu_mutex_unlock(QemuMutex *mutex)
+{
+    int err;
+
+    err = pthread_mutex_unlock(&mutex->lock);
+    if (err)
+        error_exit(err, __func__);
+}
+
+void qemu_cond_init(QemuCond *cond)
+{
+    int err;
+
+    err = pthread_cond_init(&cond->cond, NULL);
+    if (err)
+        error_exit(err, __func__);
+}
+
+void qemu_cond_signal(QemuCond *cond)
+{
+    int err;
+
+    err = pthread_cond_signal(&cond->cond);
+    if (err)
+        error_exit(err, __func__);
+}
+
+void qemu_cond_broadcast(QemuCond *cond)
+{
+    int err;
+
+    err = pthread_cond_broadcast(&cond->cond);
+    if (err)
+        error_exit(err, __func__);
+}
+
+void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
+{
+    int err;
+
+    err = pthread_cond_wait(&cond->cond, &mutex->lock);
+    if (err)
+        error_exit(err, __func__);
+}
+
+int qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex, uint64_t msecs)
+{
+    struct timespec ts;
+    int err;
+
+    clock_gettime(CLOCK_REALTIME, &ts);
+    timespec_add_ms(&ts, msecs);
+
+    err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts);
+    if (err && err != ETIMEDOUT)
+        error_exit(err, __func__);
+    return err;
+}
+
+void qemu_thread_create(QemuThread *thread,
+                       void *(*start_routine)(void*),
+                       void *arg)
+{
+    int err;
+
+    err = pthread_create(&thread->thread, NULL, start_routine, arg);
+    if (err)
+        error_exit(err, __func__);
+}
+
+void qemu_thread_signal(QemuThread *thread, int sig)
+{
+    int err;
+
+    err = pthread_kill(thread->thread, sig);
+    if (err)
+        error_exit(err, __func__);
+}
+
+void qemu_thread_self(QemuThread *thread)
+{
+    thread->thread = pthread_self();
+}
+
+int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2)
+{
+   return (thread1->thread == thread2->thread);
+}
+
diff --git a/qemu-thread.h b/qemu-thread.h
new file mode 100644
index 0000000000..5ef4a3aed5
--- /dev/null
+++ b/qemu-thread.h
@@ -0,0 +1,40 @@
+#ifndef __QEMU_THREAD_H
+#define __QEMU_THREAD_H 1
+#include "semaphore.h"
+#include "pthread.h"
+
+struct QemuMutex {
+    pthread_mutex_t lock;
+};
+
+struct QemuCond {
+    pthread_cond_t cond;
+};
+
+struct QemuThread {
+    pthread_t thread;
+};
+
+typedef struct QemuMutex QemuMutex;
+typedef struct QemuCond QemuCond;
+typedef struct QemuThread QemuThread;
+
+void qemu_mutex_init(QemuMutex *mutex);
+void qemu_mutex_lock(QemuMutex *mutex);
+int qemu_mutex_trylock(QemuMutex *mutex);
+int qemu_mutex_timedlock(QemuMutex *mutex, uint64_t msecs);
+void qemu_mutex_unlock(QemuMutex *mutex);
+
+void qemu_cond_init(QemuCond *cond);
+void qemu_cond_signal(QemuCond *cond);
+void qemu_cond_broadcast(QemuCond *cond);
+void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex);
+int qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex, uint64_t msecs);
+
+void qemu_thread_create(QemuThread *thread,
+                       void *(*start_routine)(void*),
+                       void *arg);
+void qemu_thread_signal(QemuThread *thread, int sig);
+void qemu_thread_self(QemuThread *thread);
+int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2);
+#endif