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[client] syncronization improvements

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This commit is contained in:
Geoffrey McRae 2017-11-28 15:16:51 +11:00
parent 2da40012ca
commit f767f32a32
1 changed files with 35 additions and 38 deletions
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73
client/main.c
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@ -121,48 +121,18 @@ int renderThread(void * unused)
{
// copy the header for our use
memcpy(&newHeader, state.shm, sizeof(struct KVMGFXHeader));
ivshmem_kick_irq(newHeader.guestID, 0);
// ensure the header magic is valid, this will help prevent crash out when the memory hasn't yet been initialized
if (memcmp(newHeader.magic, KVMGFX_HEADER_MAGIC, sizeof(KVMGFX_HEADER_MAGIC)) != 0)
continue;
if (newHeader.version != KVMGFX_HEADER_VERSION)
continue;
bool ready = false;
bool error = false;
while(state.running && !ready && !error)
if (
memcmp(newHeader.magic, KVMGFX_HEADER_MAGIC, sizeof(KVMGFX_HEADER_MAGIC)) != 0 ||
newHeader.version != KVMGFX_HEADER_VERSION
)
{
// kick the guest and wait for a frame
switch(ivshmem_wait_irq(0))
{
case IVSHMEM_WAIT_RESULT_OK:
ready = true;
break;
case IVSHMEM_WAIT_RESULT_TIMEOUT:
ivshmem_kick_irq(newHeader.guestID, 0);
ready = false;
break;
case IVSHMEM_WAIT_RESULT_ERROR:
error = true;
break;
}
usleep(1000);
continue;
}
if (error)
{
DEBUG_ERROR("error during wait for host");
break;
}
// we can tell the guest to advance early, it won't
// touch the frame @ dataPos as it double buffers
// so we can safely read from it while the guest now
// writes the next frame
ivshmem_kick_irq(newHeader.guestID, 0);
// if the header is invalid or it has changed
if (!areFormatsSame(header, newHeader))
{
@ -372,8 +342,35 @@ int renderThread(void * unused)
}
SDL_RenderPresent(state.renderer);
state.started = true;
bool ready = false;
bool error = false;
while(state.running && !ready && !error)
{
// kick the guest and wait for a frame
switch(ivshmem_wait_irq(0))
{
case IVSHMEM_WAIT_RESULT_OK:
ready = true;
break;
case IVSHMEM_WAIT_RESULT_TIMEOUT:
ivshmem_kick_irq(newHeader.guestID, 0);
ready = false;
break;
case IVSHMEM_WAIT_RESULT_ERROR:
error = true;
break;
}
}
if (error)
{
DEBUG_ERROR("error during wait for host");
break;
}
}
state.running = false;