Re: [Qemu-devel] [PATCH 05/30] migration: make qemu_fopen_ops_buffered() return void

[Orit Wasserman <owasserm@redhat.com>]

On 10/18/2012 09:30 AM, Juan Quintela wrote:
> We want the file assignment to happen before the thread is created to
> avoid locking, so we just do it before creating the thread.
> 
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> ---
>  buffered_file.c | 13 ++++++-------
>  buffered_file.h |  2 +-
>  migration.c     |  2 +-
>  migration.h     |  1 +
>  4 files changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/buffered_file.c b/buffered_file.c
> index 4b90d54..6395b37 100644
> --- a/buffered_file.c
> +++ b/buffered_file.c
> @@ -33,7 +33,6 @@ typedef struct QEMUFileBuffered
>      size_t buffer_size;
>      size_t buffer_capacity;
>      QemuThread thread;
> -    bool complete;
>  } QEMUFileBuffered;
> 
>  #ifdef DEBUG_BUFFERED_FILE
> @@ -163,7 +162,7 @@ static int buffered_close(void *opaque)
>          ret = ret2;
>      }
>      ret = migrate_fd_close(s->migration_state);
> -    s->complete = true;
> +    s->migration_state->complete = true;
>      return ret;
>  }
> 
> @@ -225,7 +224,7 @@ static void *buffered_file_thread(void *opaque)
>      while (true) {
>          int64_t current_time = qemu_get_clock_ms(rt_clock);
> 
> -        if (s->complete) {
> +        if (s->migration_state->complete) {
>              break;
>          }
>          if (s->freeze_output) {
> @@ -248,7 +247,7 @@ static void *buffered_file_thread(void *opaque)
>      return NULL;
>  }
> 
> -QEMUFile *qemu_fopen_ops_buffered(MigrationState *migration_state)
> +void qemu_fopen_ops_buffered(MigrationState *migration_state)
>  {
>      QEMUFileBuffered *s;
> 
> @@ -256,15 +255,15 @@ QEMUFile *qemu_fopen_ops_buffered(MigrationState *migration_state)
> 
>      s->migration_state = migration_state;
>      s->xfer_limit = migration_state->bandwidth_limit / 10;
> -    s->complete = false;
> +    s->migration_state->complete = false;
> 
>      s->file = qemu_fopen_ops(s, buffered_put_buffer, NULL,
>                               buffered_close, buffered_rate_limit,
>                               buffered_set_rate_limit,
>  			     buffered_get_rate_limit);
> 
> +    migration_state->file = s->file;
> +
>      qemu_thread_create(&s->thread, buffered_file_thread, s,
>                         QEMU_THREAD_DETACHED);
> -
> -    return s->file;
>  }
> diff --git a/buffered_file.h b/buffered_file.h
> index ef010fe..8a246fd 100644
> --- a/buffered_file.h
> +++ b/buffered_file.h
> @@ -17,6 +17,6 @@
>  #include "hw/hw.h"
>  #include "migration.h"
> 
> -QEMUFile *qemu_fopen_ops_buffered(MigrationState *migration_state);
> +void qemu_fopen_ops_buffered(MigrationState *migration_state);
> 
>  #endif
> diff --git a/migration.c b/migration.c
> index 62e0304..02f4ffa 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -431,7 +431,7 @@ void migrate_fd_connect(MigrationState *s)
>      int ret;
> 
>      s->state = MIG_STATE_ACTIVE;
> -    s->file = qemu_fopen_ops_buffered(s);
> +    qemu_fopen_ops_buffered(s);
> 
>      DPRINTF("beginning savevm\n");
>      ret = qemu_savevm_state_begin(s->file, &s->params);
> diff --git a/migration.h b/migration.h
> index 1c3e9b7..a63c5d5 100644
> --- a/migration.h
> +++ b/migration.h
> @@ -45,6 +45,7 @@ struct MigrationState
>      int64_t dirty_pages_rate;
>      bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
>      int64_t xbzrle_cache_size;
> +    bool complete;
>  };
> 
>  void process_incoming_migration(QEMUFile *f);
> 
Reviewed-by: Orit Wasserman <owasserm@redhat.com>