Re: [Qemu-devel] [PATCH 2/7] Enable I/O thread and VNC threads by default

[Paolo Bonzini <pbonzini@redhat.com>]

On 02/09/2011 11:16 PM, Stefan Weil wrote:
> The patch is available here:
> http://repo.or.cz/w/qemu/ar7.git/commitdiff/aabf11dc0a938b84d76d7c147cbf0445d7bee297

> diff --git a/hosts/w32/include/signal.h b/hosts/w32/include/signal.h
> new file mode 100644
> index 0000000..e45f03c
> --- /dev/null
> +++ b/hosts/w32/include/signal.h
> @@ -0,0 +1,20 @@
> +/*
> + * QEMU w32 support
> + *
> + * Copyright (C) 2011 Stefan Weil
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + *
> + */
> +
> +#ifndef WIN32_SIGNAL_H
> +#define WIN32_SIGNAL_H
> +
> +#include_next <signal.h>
> +#include <sys/types.h>    /* sigset_t */
> +
> +int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
> +int sigfillset(sigset_t *set);
> +
> +#endif /* WIN32_SIGNAL_H */
> diff --git a/hosts/w32/include/time.h b/hosts/w32/include/time.h
> new file mode 100644
> index 0000000..0b997d3
> --- /dev/null
> +++ b/hosts/w32/include/time.h
> @@ -0,0 +1,31 @@
> +/*
> + * QEMU w32 support
> + *
> + * Copyright (C) 2011 Stefan Weil
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + *
> + */
> +
> +#if !defined(W32_TIME_H)
> +#define W32_TIME_H
> +
> +#include_next <time.h>
> +
> +#ifndef HAVE_STRUCT_TIMESPEC
> +#define HAVE_STRUCT_TIMESPEC 1
> +struct timespec {
> +        long tv_sec;
> +        long tv_nsec;
> +};
> +#endif /* HAVE_STRUCT_TIMESPEC */
> +
> +typedef enum {
> +  CLOCK_REALTIME = 0
> +} clockid_t;
> +
> +int clock_getres (clockid_t clock_id, struct timespec *res);
> +int clock_gettime(clockid_t clock_id, struct timespec *pTimespec);
> +
> +#endif /* W32_TIME_H */
> diff --git a/os-win32.c b/os-win32.c
> index b214e6a..7778366 100644
> --- a/os-win32.c
> +++ b/os-win32.c
> @@ -36,6 +36,45 @@
>  /***********************************************************/
>  /* Functions missing in mingw */
>
> +#if defined(CONFIG_THREAD)
> +
> +int clock_gettime(clockid_t clock_id, struct timespec *pTimespec)
> +{
> +  int result = 0;
> +  if (clock_id == CLOCK_REALTIME && pTimespec != 0) {
> +    DWORD t = GetTickCount();
> +    const unsigned cps = 1000;
> +    struct timespec ts;
> +    ts.tv_sec  = t / cps;
> +    ts.tv_nsec = (t % cps) * (1000000000UL / cps);
> +    *pTimespec = ts;
> +  } else {
> +    errno = EINVAL;
> +    result = -1;
> +  }
> +  return result;
> +}

Why is this needed?  The only user of clock_gettime in the POSIX case is 
using CLOCK_MONOTONIC, and actually has a Win32 version already.

> +int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset)
> +{
> +    /* Dummy, do nothing. */
> +    return EINVAL;
> +}
> +
> +int sigfillset(sigset_t *set)
> +{
> +    int result = 0;
> +    if (set) {
> +        *(set) = (sigset_t)(-1);
> +    } else {
> +        errno = EINVAL;
> +        result = -1;
> +    }
> +    return result;
> +}

Instead of these, it's better to provide a Win32 implementation of 
mutexes and condvars.  I'll submit it next week hopefully.

Paolo