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log: Add locking to large logging blocks

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Reuse the existing locking provided by stdio to keep in_asm, cpu,
op, op_opt, op_ind, and out_asm as contiguous blocks.

While it isn't possible to interleave e.g. in_asm or op_opt logs
because of the TB lock protecting all code generation, it is
possible to interleave cpu logs, or to interleave a cpu dump with
an out_asm dump.

For mingw32, we appear to have no viable solution for this.  The locking
functions are not properly exported from the system runtime library.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-09-22 15:17:10 -07:00
parent 9acbf7d8ca
commit 1ee73216f4
25 changed files with 98 additions and 1 deletions
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16
include/qemu/log.h
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@ -51,6 +51,22 @@ static inline bool qemu_loglevel_mask(int mask)
return (qemu_loglevel & mask) != 0;
}
/* Lock output for a series of related logs. Since this is not needed
* for a single qemu_log / qemu_log_mask / qemu_log_mask_and_addr, we
* assume that qemu_loglevel_mask has already been tested, and that
* qemu_loglevel is never set when qemu_logfile is unset.
*/
static inline void qemu_log_lock(void)
{
qemu_flockfile(qemu_logfile);
}
static inline void qemu_log_unlock(void)
{
qemu_funlockfile(qemu_logfile);
}
/* Logging functions: */
/* main logging function