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aio: introduce AioContext, move bottom halves there

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Start introducing AioContext, which will let us remove globals from
aio.c/async.c, and introduce multiple I/O threads.

The bottom half functions now take an additional AioContext argument.
A bottom half is created with a specific AioContext that remains the
same throughout the lifetime.  qemu_bh_new is just a wrapper that
uses a global context.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-10-29 23:45:23 +01:00
parent 9958c351ee
commit f627aab1cc
11 changed files with 119 additions and 72 deletions
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18
main-loop.c
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@ -26,6 +26,7 @@
#include "qemu-timer.h"
#include "slirp/slirp.h"
#include "main-loop.h"
#include "qemu-aio.h"
#ifndef _WIN32
@ -199,6 +200,8 @@ static int qemu_signal_init(void)
}
#endif
static AioContext *qemu_aio_context;
int qemu_init_main_loop(void)
{
int ret;
@ -218,6 +221,7 @@ int qemu_init_main_loop(void)
return ret;
}
qemu_aio_context = aio_context_new();
return 0;
}
@ -481,7 +485,7 @@ int main_loop_wait(int nonblocking)
if (nonblocking) {
timeout = 0;
} else {
qemu_bh_update_timeout(&timeout);
aio_bh_update_timeout(qemu_aio_context, &timeout);
}
/* poll any events */
@ -510,3 +514,15 @@ int main_loop_wait(int nonblocking)
return ret;
}
/* Functions to operate on the main QEMU AioContext. */
QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
{
return aio_bh_new(qemu_aio_context, cb, opaque);
}
int qemu_bh_poll(void)
{
return aio_bh_poll(qemu_aio_context);
}