migration: Wait for blocking IO

We have three conditions here:
- channel fails -> error
- we have to quit: we close the channel and reads fails
- normal read that success, we are in bussiness

So forget the complications of waiting in a semaphore.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

diff --git a/migration/ram.c b/migration/ram.c
index b9c8f65..5d38d69 100644 (file)
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -602,8 +602,6 @@ typedef struct {
     bool running;
     /* should this thread finish */
     bool quit;
-    /* thread has work to do */
-    bool pending_job;
     /* array of pages to receive */
     MultiFDPages_t *pages;
     /* packet allocated len */
@@ -1199,14 +1197,6 @@ static void multifd_recv_sync_main(void)
     for (i = 0; i < migrate_multifd_channels(); i++) {
         MultiFDRecvParams *p = &multifd_recv_state->params[i];
 
-        trace_multifd_recv_sync_main_signal(p->id);
-        qemu_mutex_lock(&p->mutex);
-        p->pending_job = true;
-        qemu_mutex_unlock(&p->mutex);
-    }
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
         trace_multifd_recv_sync_main_wait(p->id);
         qemu_sem_wait(&multifd_recv_state->sem_sync);
         qemu_mutex_lock(&p->mutex);
@@ -1219,7 +1209,6 @@ static void multifd_recv_sync_main(void)
         MultiFDRecvParams *p = &multifd_recv_state->params[i];
 
         trace_multifd_recv_sync_main_signal(p->id);
-
         qemu_sem_post(&p->sem_sync);
     }
     trace_multifd_recv_sync_main(multifd_recv_state->packet_num);
@@ -1256,7 +1245,6 @@ static void *multifd_recv_thread(void *opaque)
         used = p->pages->used;
         flags = p->flags;
         trace_multifd_recv(p->id, p->packet_num, used, flags);
-        p->pending_job = false;
         p->num_packets++;
         p->num_pages += used;
         qemu_mutex_unlock(&p->mutex);
@@ -1306,7 +1294,6 @@ int multifd_load_setup(void)
         qemu_sem_init(&p->sem, 0);
         qemu_sem_init(&p->sem_sync, 0);
         p->quit = false;
-        p->pending_job = false;
         p->id = i;
         p->pages = multifd_pages_init(page_count);
         p->packet_len = sizeof(MultiFDPacket_t)