[1/4] qemu-thread: add API for joinable threads

From: Jan Kiszka <jan.kiszka@siemens.com>

Split from Jan's original qemu-thread-posix.c patch.  No semantic change,
just introduce the new API that POSIX and Win32 implementations will
conform to.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 cpus.c                  |    6 ++++--
 hw/ccid-card-emulated.c |    5 +++--
 qemu-thread-posix.c     |    7 ++++---
 qemu-thread-win32.c     |    4 +++-
 qemu-thread.h           |    8 ++++++--
 ui/vnc-jobs-async.c     |    2 +-
 6 files changed, 21 insertions(+), 11 deletions(-)

On 2011-12-06 18:05, Paolo Bonzini wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> Split from Jan's original qemu-thread-posix.c patch.  No semantic change,
> just introduce the new API that POSIX and Win32 implementations will
> conform to.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  cpus.c                  |    6 ++++--
>  hw/ccid-card-emulated.c |    5 +++--
>  qemu-thread-posix.c     |    7 ++++---
>  qemu-thread-win32.c     |    4 +++-
>  qemu-thread.h           |    8 ++++++--
>  ui/vnc-jobs-async.c     |    2 +-
>  6 files changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/cpus.c b/cpus.c
> index ca46ec6..cbb4617 100644
> --- a/cpus.c
> +++ b/cpus.c
> @@ -910,7 +910,8 @@ static void qemu_tcg_init_vcpu(void *_env)
>          env->halt_cond = g_malloc0(sizeof(QemuCond));
>          qemu_cond_init(env->halt_cond);
>          tcg_halt_cond = env->halt_cond;
> -        qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env);
> +        qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env,
> +                           QEMU_THREAD_DETACHED);
>          while (env->created == 0) {
>              qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
>          }
> @@ -926,7 +927,8 @@ static void qemu_kvm_start_vcpu(CPUState *env)
>      env->thread = g_malloc0(sizeof(QemuThread));
>      env->halt_cond = g_malloc0(sizeof(QemuCond));
>      qemu_cond_init(env->halt_cond);
> -    qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env);
> +    qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env,
> +                       QEMU_THREAD_DETACHED);
>      while (env->created == 0) {
>          qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
>      }
> diff --git a/hw/ccid-card-emulated.c b/hw/ccid-card-emulated.c
> index 092301b..9fe9db5 100644
> --- a/hw/ccid-card-emulated.c
> +++ b/hw/ccid-card-emulated.c
> @@ -541,8 +541,9 @@ static int emulated_initfn(CCIDCardState *base)
>          printf("%s: failed to initialize vcard\n", EMULATED_DEV_NAME);
>          return -1;
>      }
> -    qemu_thread_create(&thread_id, event_thread, card);
> -    qemu_thread_create(&thread_id, handle_apdu_thread, card);
> +    qemu_thread_create(&thread_id, event_thread, card, QEMU_THREAD_DETACHED);
> +    qemu_thread_create(&thread_id, handle_apdu_thread, card,
> +                       QEMU_THREAD_DETACHED);
>      return 0;
>  }
>  
> diff --git a/qemu-thread-posix.c b/qemu-thread-posix.c
> index ac3c0c9..49d3388 100644
> --- a/qemu-thread-posix.c
> +++ b/qemu-thread-posix.c
> @@ -117,13 +117,14 @@ void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
>  
>  void qemu_thread_create(QemuThread *thread,
>                         void *(*start_routine)(void*),
> -                       void *arg)
> +                       void *arg, int mode)
>  {
> +    sigset_t set, oldset;
>      int err;
>  
> -    /* Leave signal handling to the iothread.  */
> -    sigset_t set, oldset;
> +    assert(mode == QEMU_THREAD_DETACHED);
>  
> +    /* Leave signal handling to the iothread.  */
>      sigfillset(&set);
>      pthread_sigmask(SIG_SETMASK, &set, &oldset);
>      err = pthread_create(&thread->thread, NULL, start_routine, arg);
> diff --git a/qemu-thread-win32.c b/qemu-thread-win32.c
> index db8e744..ff80e84 100644
> --- a/qemu-thread-win32.c
> +++ b/qemu-thread-win32.c
> @@ -243,10 +243,12 @@ static inline void qemu_thread_init(void)
>  
>  void qemu_thread_create(QemuThread *thread,
>                         void *(*start_routine)(void *),
> -                       void *arg)
> +                       void *arg, int mode)
>  {
>      HANDLE hThread;
>  
> +    assert(mode == QEMU_THREAD_DETACHED);
> +
>      struct QemuThreadData *data;
>      qemu_thread_init();
>      data = g_malloc(sizeof *data);
> diff --git a/qemu-thread.h b/qemu-thread.h
> index e008b60..a78a8f2 100644
> --- a/qemu-thread.h
> +++ b/qemu-thread.h
> @@ -13,6 +13,9 @@ typedef struct QemuThread QemuThread;
>  #include "qemu-thread-posix.h"
>  #endif
>  
> +#define QEMU_THREAD_JOINABLE 0
> +#define QEMU_THREAD_DETACHED 1
> +
>  void qemu_mutex_init(QemuMutex *mutex);
>  void qemu_mutex_destroy(QemuMutex *mutex);
>  void qemu_mutex_lock(QemuMutex *mutex);
> @@ -35,8 +38,9 @@ void qemu_cond_broadcast(QemuCond *cond);
>  void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex);
>  
>  void qemu_thread_create(QemuThread *thread,
> -                       void *(*start_routine)(void*),
> -                       void *arg);
> +                        void *(*start_routine)(void *),
> +                        void *arg, int mode);
> +void *qemu_thread_join(QemuThread *thread);
>  void qemu_thread_get_self(QemuThread *thread);
>  int qemu_thread_is_self(QemuThread *thread);
>  void qemu_thread_exit(void *retval);
> diff --git a/ui/vnc-jobs-async.c b/ui/vnc-jobs-async.c
> index de5ea6b..9b3016c 100644
> --- a/ui/vnc-jobs-async.c
> +++ b/ui/vnc-jobs-async.c
> @@ -318,7 +318,7 @@ void vnc_start_worker_thread(void)
>          return ;
>  
>      q = vnc_queue_init();
> -    qemu_thread_create(&q->thread, vnc_worker_thread, q);
> +    qemu_thread_create(&q->thread, vnc_worker_thread, q, QEMU_THREAD_DETACHED);
>      queue = q; /* Set global queue */
>  }
>  

Acked - but I already signed it anyway.

Jan