IO-AIO/AIO.xs

#include "libeio/xthread.h"

#include <errno.h>

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <stddef.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <fcntl.h>
#include <sched.h>

/* perl namespace pollution */
#undef VERSION

#ifdef _WIN32

# define EIO_STRUCT_DIRENT Direntry_t
# undef malloc
# undef free

// perl overrides all those nice win32 functions
# undef open
# undef read
# undef write
# undef send
# undef recv
# undef stat
# undef fstat
# define lstat stat
# undef truncate
# undef ftruncate
# undef open
# undef close
# undef unlink
# undef rmdir
# undef rename
# undef lseek

# define chown(a,b,c)    (errno = ENOSYS, -1)
# define fchown(a,b,c)   (errno = ENOSYS, -1)
# define fchmod(a,b)     (errno = ENOSYS, -1)
# define symlink(a,b)    (errno = ENOSYS, -1)
# define readlink(a,b,c) (errno = ENOSYS, -1)
# define mknod(a,b,c)    (errno = ENOSYS, -1)
# define truncate(a,b)   (errno = ENOSYS, -1)
# define ftruncate(fd,o) chsize ((fd), (o))
# define fsync(fd)       _commit (fd)
# define opendir(fd)     (errno = ENOSYS, 0)
# define readdir(fd)     (errno = ENOSYS, -1)
# define closedir(fd)    (errno = ENOSYS, -1)
# define mkdir(a,b)      mkdir (a)

#else

# include <sys/time.h>
# include <sys/select.h>
# include <unistd.h>
# include <utime.h>
# include <signal.h>
# define EIO_STRUCT_DIRENT struct dirent

#endif

#define EIO_STRUCT_STAT Stat_t

/* use NV for 32 bit perls as it allows larger offsets */
#if IVSIZE >= 8
# define SvVAL64 SvIV
#else
# define SvVAL64 SvNV
#endif

static HV *stash;
typedef SV SV8; /* byte-sv, used for argument-checking */

#define AIO_REQ_KLASS "IO::AIO::REQ"
#define AIO_GRP_KLASS "IO::AIO::GRP"

#define EIO_COMMON      \
  SV *callback;         \
  SV *sv1, *sv2;        \
  STRLEN stroffset;     \
  SV *self

#include "libeio/eio.h"

static int req_invoke    (eio_req *req);
#define EIO_FINISH(req)  req_invoke (req)
static void aio_grp_feed (eio_req *grp);
#define EIO_FEED(req)    aio_grp_feed (req)
static void req_destroy  (eio_req *grp);
#define EIO_DESTROY(req) req_destroy (req)

enum {
  FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
};

#include "libeio/eio.c"

typedef eio_req *aio_req;
typedef eio_req *aio_req_ornot;

static SV *on_next_submit;
static int next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS;
static int max_outstanding;

static int respipe_osf [2], respipe [2] = { -1, -1 };

static void req_destroy (aio_req req);
static void req_cancel (aio_req req);

static void want_poll (void)
{
  /* write a dummy byte to the pipe so fh becomes ready */
  respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
}

static void done_poll (void)
{
  /* read any signals sent by the worker threads */
  char buf [4];
  while (respipe_read (respipe [0], buf, 4) == 4)
    ;
}

/* must be called at most once */
static SV *req_sv (aio_req req, const char *klass)
{
  if (!req->self)
    {
      req->self = (SV *)newHV ();
      sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
    }

  return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
}

static aio_req SvAIO_REQ (SV *sv)
{
  MAGIC *mg;

  if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
    croak ("object of class " AIO_REQ_KLASS " expected");

  mg = mg_find (SvRV (sv), PERL_MAGIC_ext);

  return mg ? (aio_req)mg->mg_ptr : 0;
}

static void aio_grp_feed (aio_req grp)
{
  if (grp->sv2 && SvOK (grp->sv2))
    {
      dSP;

      ENTER;
      SAVETMPS;
      PUSHMARK (SP);
      XPUSHs (req_sv (grp, AIO_GRP_KLASS));
      PUTBACK;
      call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
      SPAGAIN;
      FREETMPS;
      LEAVE;
    }
}

static void req_submit (eio_req *req)
{
  eio_submit (req);

  if (on_next_submit)
    {
      dSP;
      SV *cb = sv_2mortal (on_next_submit);

      on_next_submit = 0;

      PUSHMARK (SP);
      PUTBACK;
      call_sv (cb, G_DISCARD | G_EVAL);
    }
}

static int req_invoke (eio_req *req)
{
  dSP;

  if (req->flags & FLAG_SV2_RO_OFF)
    SvREADONLY_off (req->sv2);

  if (!EIO_CANCELLED (req) && SvOK (req->callback))
    {
      ENTER;
      SAVETMPS;
      PUSHMARK (SP);
      EXTEND (SP, 1);

      switch (req->type)
        {
          case EIO_READDIR:
            {
              SV *rv = &PL_sv_undef;

              if (req->result >= 0)
                {
                  int i;
                  char *buf = req->ptr2;
                  AV *av = newAV ();

                  av_extend (av, req->result - 1);

                  for (i = 0; i < req->result; ++i)
                    {
                      SV *sv = newSVpv (buf, 0);

                      av_store (av, i, sv);
                      buf += SvCUR (sv) + 1;
                    }

                  rv = sv_2mortal (newRV_noinc ((SV *)av));
                }

              PUSHs (rv);
            }
            break;

          case EIO_OPEN:
            {
              /* convert fd to fh */
              SV *fh = &PL_sv_undef;

              if (req->result >= 0)
                {
                  GV *gv = (GV *)sv_newmortal ();
                  int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
                  char sym [64];
                  int symlen;
                  
                  symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
                  gv_init (gv, stash, sym, symlen, 0);

                  symlen = snprintf (
                     sym,
                     sizeof (sym),
                     "%s&=%d",
                     flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
                     req->result
                  );

                  if (do_open (gv, sym, symlen, 0, 0, 0, 0))
                    fh = (SV *)gv;
                }

              PUSHs (fh);
            }
            break;

          case EIO_GROUP:
            req->int1 = 2; /* mark group as finished */

            if (req->sv1)
              {
                int i;
                AV *av = (AV *)req->sv1;

                EXTEND (SP, AvFILL (av) + 1);
                for (i = 0; i <= AvFILL (av); ++i)
                  PUSHs (*av_fetch (av, i, 0));
              }
            break;

          case EIO_NOP:
          case EIO_BUSY:
            break;

          case EIO_READLINK:
            if (req->result > 0)
              PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
            break;

          case EIO_STAT:
          case EIO_LSTAT:
          case EIO_FSTAT:
            PL_laststype   = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
            PL_laststatval = req->result;
            PL_statcache   = *(EIO_STRUCT_STAT *)(req->ptr2);
            PUSHs (sv_2mortal (newSViv (req->result)));
            break;

          case EIO_READ:
            SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
            *SvEND (req->sv2) = 0;
            PUSHs (sv_2mortal (newSViv (req->result)));
            break;

          case EIO_DUP2:
            if (req->result > 0)
              req->result = 0;
            /* FALLTHROUGH */

          default:
            PUSHs (sv_2mortal (newSViv (req->result)));
            break;
        }

      errno = req->errorno;

      PUTBACK;
      call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
      SPAGAIN;

      FREETMPS;
      LEAVE;

      PUTBACK;
    }

  return !!SvTRUE (ERRSV);
}

static void req_destroy (aio_req req)
{
  if (req->self)
    {
      sv_unmagic (req->self, PERL_MAGIC_ext);
      SvREFCNT_dec (req->self);
    }

  SvREFCNT_dec (req->sv1);
  SvREFCNT_dec (req->sv2);
  SvREFCNT_dec (req->callback);

  Safefree (req);
}

static void req_cancel_subs (aio_req grp)
{
  aio_req sub;

  if (grp->type != EIO_GROUP)
    return;

  SvREFCNT_dec (grp->sv2);
  grp->sv2 = 0;

  eio_grp_cancel (grp);
}

#ifdef USE_SOCKETS_AS_HANDLES
# define TO_SOCKET(x) (win32_get_osfhandle (x))
#else
# define TO_SOCKET(x) (x)
#endif

static void
create_respipe (void)
{
  int old_readfd = respipe [0];

  if (respipe [1] >= 0)
    respipe_close (TO_SOCKET (respipe [1]));

#ifdef _WIN32
  if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
#else
  if (pipe (respipe))
#endif
    croak ("unable to initialize result pipe");

  if (old_readfd >= 0)
    {
      if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
        croak ("unable to initialize result pipe(2)");

      respipe_close (respipe [0]);
      respipe [0] = old_readfd;
    }

#ifdef _WIN32
  int arg = 1;
  if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
      || ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
#else
  if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
      || fcntl (respipe [1], F_SETFL, O_NONBLOCK))
#endif
    croak ("unable to initialize result pipe(3)");

  respipe_osf [0] = TO_SOCKET (respipe [0]);
  respipe_osf [1] = TO_SOCKET (respipe [1]);
}

static void poll_wait (void)
{
  fd_set rfd;

  while (eio_nreqs ())
    {
      int size;

      X_LOCK   (reslock);
      size = res_queue.size;
      X_UNLOCK (reslock);

      if (size)
        return;

      maybe_start_thread ();

      FD_ZERO (&rfd);
      FD_SET (respipe [0], &rfd);

      PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
    }
}

static int poll_cb (void)
{
  int res;

  do 
    {
      res = eio_poll ();

      if (res > 0)
        croak (0);
    }
  while (max_outstanding && max_outstanding <= eio_nreqs ());

  return res;
}

static void atfork_child (void)
{
  create_respipe ();
}

#define dREQ                                                    \
  aio_req req;                                                  \
  int req_pri = next_pri;                                       \
  next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS;                    \
                                                                \
  if (SvOK (callback) && !SvROK (callback))                     \
    croak ("callback must be undef or of reference type");      \
                                                                \
  Newz (0, req, 1, eio_req);                                    \
  if (!req)                                                     \
    croak ("out of memory during eio_req allocation");          \
                                                                \
  req->callback = newSVsv (callback);                           \
  req->pri = req_pri

#define REQ_SEND                                                \
  req_submit (req);                                             \
                                                                \
  if (GIMME_V != G_VOID)                                        \
    XPUSHs (req_sv (req, AIO_REQ_KLASS));
        
MODULE = IO::AIO                PACKAGE = IO::AIO

PROTOTYPES: ENABLE

BOOT:
{
        stash = gv_stashpv ("IO::AIO", 1);

        newCONSTSUB (stash, "EXDEV",    newSViv (EXDEV));
        newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
        newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
        newCONSTSUB (stash, "O_CREAT",  newSViv (O_CREAT));
        newCONSTSUB (stash, "O_TRUNC",  newSViv (O_TRUNC));
#ifdef _WIN32
        X_MUTEX_CHECK (wrklock);
        X_MUTEX_CHECK (reslock);
        X_MUTEX_CHECK (reqlock);
        X_MUTEX_CHECK (reqwait);
        X_MUTEX_CHECK (preadwritelock);
        X_MUTEX_CHECK (readdirlock);

        X_COND_CHECK  (reqwait);
#else
        newCONSTSUB (stash, "S_IFIFO",  newSViv (S_IFIFO));
#endif

        create_respipe ();

        if (eio_init (want_poll, done_poll) < 0)
          croak ("IO::AIO: unable to initialise eio library");

        /* atfork child called in fifo order, so before eio's handler */
        X_THREAD_ATFORK (0, 0, atfork_child);
}

void
max_poll_reqs (int nreqs)
        PROTOTYPE: $
        CODE:
        eio_set_max_poll_reqs (nreqs);

void
max_poll_time (double nseconds)
        PROTOTYPE: $
        CODE:
        eio_set_max_poll_time (nseconds);

void
min_parallel (int nthreads)
        PROTOTYPE: $
        CODE:
        eio_set_min_parallel (nthreads);

void
max_parallel (int nthreads)
        PROTOTYPE: $
        CODE:
        eio_set_max_parallel (nthreads);

void
max_idle (int nthreads)
        PROTOTYPE: $
        CODE:
        eio_set_max_idle (nthreads);

void
max_outstanding (int maxreqs)
        PROTOTYPE: $
        CODE:
        max_outstanding = maxreqs;

void
aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
        PROTOTYPE: $$$;$
        PPCODE:
{
        dREQ;

        req->type = EIO_OPEN;
        req->sv1  = newSVsv (pathname);
        req->ptr1 = SvPVbyte_nolen (req->sv1);
        req->int1 = flags;
        req->int2 = mode;

        REQ_SEND;
}

void
aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
        PROTOTYPE: $;$
        ALIAS:
           aio_fsync     = EIO_FSYNC
           aio_fdatasync = EIO_FDATASYNC
        PPCODE:
{
        dREQ;

        req->type = ix;
        req->sv1  = newSVsv (fh);
        req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));

        REQ_SEND (req);
}

void
aio_close (SV *fh, SV *callback=&PL_sv_undef)
        PROTOTYPE: $;$
        PPCODE:
{
        static int close_pipe = -1; /* dummy fd to close fds via dup2 */
        dREQ;

        if (close_pipe < 0)
          {
            int pipefd [2];

            if (pipe (pipefd) < 0
                || close (pipefd [1]) < 0
                || fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
              abort (); /*D*/

            close_pipe = pipefd [0];
          }

        req->type = EIO_DUP2;
        req->int1 = close_pipe;
        req->sv2  = newSVsv (fh);
        req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));

        REQ_SEND (req);
}

void
aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
        ALIAS:
           aio_read  = EIO_READ
           aio_write = EIO_WRITE
        PROTOTYPE: $$$$$;$
        PPCODE:
{
        STRLEN svlen;
        char *svptr = SvPVbyte (data, svlen);
        UV len = SvUV (length);

        SvUPGRADE (data, SVt_PV);
        SvPOK_on (data);

        if (dataoffset < 0)
          dataoffset += svlen;

        if (dataoffset < 0 || dataoffset > svlen)
          croak ("dataoffset outside of data scalar");

        if (ix == EIO_WRITE)
          {
            /* write: check length and adjust. */
            if (!SvOK (length) || len + dataoffset > svlen)
              len = svlen - dataoffset;
          }
        else
          {
            /* read: grow scalar as necessary */
            svptr = SvGROW (data, len + dataoffset + 1);
          }

        if (len < 0)
          croak ("length must not be negative");

        {
          dREQ;

          req->type = ix;
          req->sv1  = newSVsv (fh);
          req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
                                                    : IoOFP (sv_2io (fh)));
          req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
          req->size = len;
          req->sv2  = SvREFCNT_inc (data);
          req->ptr2 = (char *)svptr + dataoffset;
          req->stroffset = dataoffset;

          if (!SvREADONLY (data))
            {
              SvREADONLY_on (data);
              req->flags |= FLAG_SV2_RO_OFF;
            }

          REQ_SEND;
        }
}

void
aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
        PROTOTYPE: $$;$
        PPCODE:
{
        SV *data;
        dREQ;

        req->type = EIO_READLINK;
        req->sv1  = newSVsv (path);
        req->ptr1 = SvPVbyte_nolen (req->sv1);

        REQ_SEND;
}

void
aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
        PROTOTYPE: $$$$;$
        PPCODE:
{
        dREQ;

        req->type = EIO_SENDFILE;
        req->sv1  = newSVsv (out_fh);
        req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
        req->sv2  = newSVsv (in_fh);
        req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
        req->offs = SvVAL64 (in_offset);
        req->size = length;

        REQ_SEND;
}

void
aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
        PROTOTYPE: $$$;$
        PPCODE:
{
        dREQ;

        req->type = EIO_READAHEAD;
        req->sv1  = newSVsv (fh);
        req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
        req->offs = SvVAL64 (offset);
        req->size = length;

        REQ_SEND;
}

void
aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
        ALIAS:
           aio_stat  = EIO_STAT
           aio_lstat = EIO_LSTAT
        PPCODE:
{
        dREQ;

        req->sv1 = newSVsv (fh_or_path);

        if (SvPOK (req->sv1))
          {
            req->type = ix;
            req->ptr1 = SvPVbyte_nolen (req->sv1);
          }
        else
          {
            req->type = EIO_FSTAT;
            req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
          }

        REQ_SEND;
}

void
aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
        PPCODE:
{
        dREQ;

        req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
        req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
        req->sv1 = newSVsv (fh_or_path);

        if (SvPOK (req->sv1))
          {
            req->type = EIO_UTIME;
            req->ptr1 = SvPVbyte_nolen (req->sv1);
          }
        else
          {
            req->type = EIO_FUTIME;
            req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
          }

        REQ_SEND;
}

void
aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
        PPCODE:
{
        dREQ;

        req->sv1  = newSVsv (fh_or_path);
        req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;

        if (SvPOK (req->sv1))
          {
            req->type = EIO_TRUNCATE;
            req->ptr1 = SvPVbyte_nolen (req->sv1);
          }
        else
          {
            req->type = EIO_FTRUNCATE;
            req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
          }

        REQ_SEND;
}

void
aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
        ALIAS:
        aio_chmod  = EIO_CHMOD
        aio_mkdir  = EIO_MKDIR
        PPCODE:
{
        dREQ;

        req->int2 = mode;
        req->sv1  = newSVsv (fh_or_path);

        if (SvPOK (req->sv1))
          {
            req->type = EIO_FCHMOD;
            req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
          }
        else
          {
            req->type = ix;
            req->ptr1 = SvPVbyte_nolen (req->sv1);
          }

        REQ_SEND;
}

void
aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
        PPCODE:
{
        dREQ;

        req->int2 = SvOK (uid) ? SvIV (uid) : -1;
        req->int3 = SvOK (gid) ? SvIV (gid) : -1;
        req->sv1  = newSVsv (fh_or_path);

        if (SvPOK (req->sv1))
          {
            req->type = EIO_CHOWN;
            req->ptr1 = SvPVbyte_nolen (req->sv1);
          }
        else
          {
            req->type = EIO_FCHOWN;
            req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
          }

        REQ_SEND;
}

void
aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
        ALIAS:
           aio_unlink  = EIO_UNLINK
           aio_rmdir   = EIO_RMDIR
           aio_readdir = EIO_READDIR
        PPCODE:
{
        dREQ;
        
        req->type = ix;
        req->sv1  = newSVsv (pathname);
        req->ptr1 = SvPVbyte_nolen (req->sv1);

        REQ_SEND;
}

void
aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
        ALIAS:
           aio_link    = EIO_LINK
           aio_symlink = EIO_SYMLINK
           aio_rename  = EIO_RENAME
        PPCODE:
{
        dREQ;
        
        req->type = ix;
        req->sv1  = newSVsv (oldpath);
        req->ptr1 = SvPVbyte_nolen (req->sv1);
        req->sv2  = newSVsv (newpath);
        req->ptr2 = SvPVbyte_nolen (req->sv2);
        
        REQ_SEND;
}

void
aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
        PPCODE:
{
        dREQ;
        
        req->type = EIO_MKNOD;
        req->sv1  = newSVsv (pathname);
        req->ptr1 = SvPVbyte_nolen (req->sv1);
        req->int2 = (mode_t)mode;
        req->offs = dev;
        
        REQ_SEND;
}

void
aio_busy (double delay, SV *callback=&PL_sv_undef)
        PPCODE:
{
        dREQ;

        req->type = EIO_BUSY;
        req->nv1  = delay < 0. ? 0. : delay;

        REQ_SEND;
}

void
aio_group (SV *callback=&PL_sv_undef)
        PROTOTYPE: ;$
        PPCODE:
{
        dREQ;

        req->type = EIO_GROUP;

        eio_submit (req);
        XPUSHs (req_sv (req, AIO_GRP_KLASS));
}

void
aio_nop (SV *callback=&PL_sv_undef)
        ALIAS:
           aio_nop  = EIO_NOP
           aio_sync = EIO_SYNC
        PPCODE:
{
        dREQ;

        req->type = ix;

        REQ_SEND;
}

int
aioreq_pri (int pri = 0)
        PROTOTYPE: ;$
        CODE:
        RETVAL = next_pri - EIO_PRI_BIAS;
        if (items > 0)
          {
            if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
            if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
            next_pri = pri + EIO_PRI_BIAS;
          }
        OUTPUT:
        RETVAL

void
aioreq_nice (int nice = 0)
        CODE:
        nice = next_pri - nice;
        if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
        if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
        next_pri = nice + EIO_PRI_BIAS;

void
flush ()
        PROTOTYPE:
        CODE:
        while (eio_nreqs ())
          {
            poll_wait ();
            poll_cb ();
          }

int
poll()
        PROTOTYPE:
        CODE:
        poll_wait ();
        RETVAL = poll_cb ();
        OUTPUT:
        RETVAL

int
poll_fileno()
        PROTOTYPE:
        CODE:
        RETVAL = respipe [0];
        OUTPUT:
        RETVAL

int
poll_cb(...)
        PROTOTYPE:
        CODE:
        RETVAL = poll_cb ();
        OUTPUT:
        RETVAL

void
poll_wait()
        PROTOTYPE:
        CODE:
        poll_wait ();

int
nreqs()
        PROTOTYPE:
        CODE:
        RETVAL = eio_nreqs ();
        OUTPUT:
        RETVAL

int
nready()
        PROTOTYPE:
        CODE:
        RETVAL = eio_nready ();
        OUTPUT:
        RETVAL

int
npending()
        PROTOTYPE:
        CODE:
        RETVAL = eio_npending ();
        OUTPUT:
        RETVAL

int
nthreads()
        PROTOTYPE:
        CODE:
        if (WORDACCESS_UNSAFE) X_LOCK   (wrklock);
        RETVAL = started;
        if (WORDACCESS_UNSAFE) X_UNLOCK (wrklock);
        OUTPUT:
        RETVAL

void _on_next_submit (SV *cb)
        CODE:
        SvREFCNT_dec (on_next_submit);
        on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;

PROTOTYPES: DISABLE

MODULE = IO::AIO                PACKAGE = IO::AIO::REQ

void
cancel (aio_req_ornot req)
        CODE:
        eio_cancel (req);

void
cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
        CODE:
        SvREFCNT_dec (req->callback);
        req->callback = newSVsv (callback);

MODULE = IO::AIO                PACKAGE = IO::AIO::GRP

void
add (aio_req grp, ...)
        PPCODE:
{
        int i;

        if (grp->int1 == 2)
          croak ("cannot add requests to IO::AIO::GRP after the group finished");

        for (i = 1; i < items; ++i )
          {
            aio_req req;

            if (GIMME_V != G_VOID)
              XPUSHs (sv_2mortal (newSVsv (ST (i))));

            req = SvAIO_REQ (ST (i));

            if (req)
              eio_grp_add (grp, req);
          }
}

void
cancel_subs (aio_req_ornot req)
        CODE:
        req_cancel_subs (req);

void
result (aio_req grp, ...)
        CODE:
{
        int i;
        AV *av;

        grp->errorno = errno;

        av = newAV ();

        for (i = 1; i < items; ++i )
          av_push (av, newSVsv (ST (i)));

        SvREFCNT_dec (grp->sv1);
        grp->sv1 = (SV *)av;
}

void
errno (aio_req grp, int errorno = errno)
        CODE:
        grp->errorno = errorno;

void
limit (aio_req grp, int limit)
        CODE:
        eio_grp_limit (grp, limit);

void
feed (aio_req grp, SV *callback=&PL_sv_undef)
        CODE:
{
        SvREFCNT_dec (grp->sv2);
        grp->sv2 = newSVsv (callback);

        if (grp->int2 <= 0)
          grp->int2 = 2;

        eio_grp_limit (grp, grp->int2);
}

Revision:	1.119
Committed:	Sun May 11 19:11:05 2008 UTC (16 years ago) by root
Branch:	MAIN
Changes since 1.118:	+14 -27 lines
Log Message:	implement high-level eio functions (untested), bugfixes