Async-Interrupt/Interrupt.xs

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

#include "ecb.h"
#include "schmorp.h"

typedef volatile sig_atomic_t atomic_t;

static int *sig_pending, *psig_pend; /* make local copies because of missing THX */
static Sighandler_t old_sighandler;
static atomic_t async_pending;

#define PERL_VERSION_ATLEAST(a,b,c)                             \
  (PERL_REVISION > (a)                                          \
   || (PERL_REVISION == (a)                                     \
       && (PERL_VERSION > (b)                                   \
           || (PERL_VERSION == (b) && PERL_SUBVERSION >= (c)))))

#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
# define HAS_SA_SIGINFO 1
#endif

#if !PERL_VERSION_ATLEAST(5,10,0)
# undef HAS_SA_SIGINFO
#endif

/*****************************************************************************/

typedef struct {
  SV *cb;
  void (*c_cb)(pTHX_ void *c_arg, int value);
  void *c_arg;
  SV *fh_r, *fh_w;
  SV *value;
  int signum;
  int autodrain;
  ANY *scope_savestack;
  volatile int blocked;

  s_epipe ep;
  int fd_wlen;
  atomic_t fd_enable;
  atomic_t pending;
  volatile IV *valuep;
  atomic_t hysteresis;
} async_t;

static AV *asyncs;
static async_t *sig_async [SIG_SIZE];

#define SvASYNC_nrv(sv) INT2PTR (async_t *, SvIVX (sv))
#define SvASYNC(rv)     SvASYNC_nrv (SvRV (rv))

static void async_signal (void *signal_arg, int value);

static void
setsig (int signum, void (*handler)(int))
{
#if _WIN32
  signal (signum, handler);
#else
  struct sigaction sa;
  sa.sa_handler = handler;
  sigfillset (&sa.sa_mask);
  sa.sa_flags = 0; /* if we interrupt a syscall, we might drain the pipe before it became ready */
  sigaction (signum, &sa, 0);
#endif
}

static void
async_sigsend (int signum)
{
  async_signal (sig_async [signum], 0);
}

/* the main workhorse to signal */
static void
async_signal (void *signal_arg, int value)
{
  static char pipedata [8];

  async_t *async = (async_t *)signal_arg;
  int pending = async->pending;

  if (async->hysteresis)
    setsig (async->signum, SIG_IGN);

  *async->valuep = value ? value : 1;
  ECB_MEMORY_FENCE_RELEASE;
  async->pending = 1;
  ECB_MEMORY_FENCE_RELEASE;
  async_pending  = 1;
  ECB_MEMORY_FENCE_RELEASE;

  if (!async->blocked)
    {
      psig_pend [9]  = 1;
      ECB_MEMORY_FENCE_RELEASE;
      *sig_pending   = 1;
      ECB_MEMORY_FENCE_RELEASE;
    }

  if (!pending && async->fd_enable && async->ep.len)
    s_epipe_signal (&async->ep);
}

static void
handle_async (async_t *async)
{
  int old_errno = errno;
  int value = *async->valuep;

  *async->valuep = 0;
  async->pending = 0;

  /* restore signal */
  if (async->hysteresis)
    setsig (async->signum, async_sigsend);

  /* drain pipe */
  if (async->fd_enable && async->ep.len && async->autodrain)
    s_epipe_drain (&async->ep);

  if (async->c_cb)
    {
      dTHX;
      async->c_cb (aTHX_ async->c_arg, value);
    }

  if (async->cb)
    {
      dSP;

      SV *saveerr = SvOK (ERRSV) ? sv_mortalcopy (ERRSV) : 0;
      SV *savedie = PL_diehook;

      PL_diehook = 0;

      PUSHSTACKi (PERLSI_SIGNAL);

      PUSHMARK (SP);
      XPUSHs (sv_2mortal (newSViv (value)));
      PUTBACK;
      call_sv (async->cb, G_VOID | G_DISCARD | G_EVAL);

      if (SvTRUE (ERRSV))
        {
          SPAGAIN;

          PUSHMARK (SP);
          PUTBACK;
          call_sv (get_sv ("Async::Interrupt::DIED", 1), G_VOID | G_DISCARD | G_EVAL | G_KEEPERR);

          sv_setpvn (ERRSV, "", 0);
        }

      if (saveerr)
        sv_setsv (ERRSV, saveerr);

      {
        SV *oldhook = PL_diehook;
        PL_diehook = savedie;
        SvREFCNT_dec (oldhook);
      }

      POPSTACK;
    }

  errno = old_errno;
}

static void
handle_asyncs (void)
{
  int i;

  ECB_MEMORY_FENCE_ACQUIRE;

  async_pending = 0;

  for (i = AvFILLp (asyncs); i >= 0; --i)
    {
      SV *async_sv = AvARRAY (asyncs)[i];
      async_t *async = SvASYNC_nrv (async_sv);

      if (async->pending && !async->blocked)
        {
          /* temporarily keep a refcount */
          SvREFCNT_inc (async_sv);
          handle_async (async);
          SvREFCNT_dec (async_sv);

          /* the handler could have deleted any number of asyncs */
          if (i > AvFILLp (asyncs))
            i = AvFILLp (asyncs);
        }
    }
}

#if HAS_SA_SIGINFO
static Signal_t async_sighandler (int signum, siginfo_t *si, void *sarg)
{
  if (signum == 9)
    handle_asyncs ();
  else
    old_sighandler (signum, si, sarg);
}
#else
static Signal_t async_sighandler (int signum)
{
  if (signum == 9)
    handle_asyncs ();
  else
    old_sighandler (signum);
}
#endif

#define block(async) ++(async)->blocked

static void
unblock (async_t *async)
{
  --async->blocked;
  if (async->pending && !async->blocked)
    handle_async (async);
}

static void
scope_block_cb (pTHX_ void *async_sv)
{
  async_t *async = SvASYNC_nrv ((SV *)async_sv);

  async->scope_savestack = 0;
  unblock (async);
  SvREFCNT_dec (async_sv);
}

static void
scope_block (SV *async_sv)
{
  async_t *async = SvASYNC_nrv (async_sv);

  /* as a heuristic, we skip the scope block if we already are blocked */
  /* and the existing scope block used the same savestack */

  if (!async->scope_savestack || async->scope_savestack != PL_savestack)
    {
      async->scope_savestack = PL_savestack;
      block (async);

      LEAVE; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */
      SAVEDESTRUCTOR_X (scope_block_cb, (void *)SvREFCNT_inc (async_sv));
      ENTER; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */
    }
}

MODULE = Async::Interrupt               PACKAGE = Async::Interrupt

BOOT:
        old_sighandler = PL_sighandlerp;
        PL_sighandlerp = async_sighandler;
        sig_pending = &PL_sig_pending;
        psig_pend   = PL_psig_pend;
        asyncs      = newAV ();
        CvNODEBUG_on (get_cv ("Async::Interrupt::scope_block", 0)); /* otherwise calling scope can be the debugger */

PROTOTYPES: DISABLE

void
_alloc (SV *cb, void *c_cb, void *c_arg, SV *fh_r, SV *fh_w, SV *signl, SV *pvalue)
        PPCODE:
{
        SV *cv   = SvOK (cb) ? SvREFCNT_inc (s_get_cv_croak (cb)) : 0;
        async_t *async;

        Newz (0, async, 1, async_t);

        XPUSHs (sv_2mortal (newSViv (PTR2IV (async))));
        /* TODO: need to bless right now to ensure deallocation */
        av_push (asyncs, TOPs);

        SvGETMAGIC (fh_r); SvGETMAGIC (fh_w);
        if (SvOK (fh_r) || SvOK (fh_w))
          {
            int fd_r = s_fileno_croak (fh_r, 0);
            int fd_w = s_fileno_croak (fh_w, 1);

            async->fh_r      = newSVsv (fh_r);
            async->fh_w      = newSVsv (fh_w);
            async->ep.fd [0] = fd_r;
            async->ep.fd [1] = fd_w;
            async->ep.len    = 1;
            async->fd_enable = 1;
          }

        async->value     = SvROK (pvalue)
                           ? SvREFCNT_inc_NN (SvRV (pvalue))
                           : NEWSV (0, 0);

        sv_setiv (async->value, 0);
        SvIOK_only (async->value); /* just to be sure */
        SvREADONLY_on (async->value);

        async->valuep    = &(SvIVX (async->value));

        async->autodrain = 1;
        async->cb        = cv;
        async->c_cb      = c_cb;
        async->c_arg     = c_arg;
        async->signum    = SvOK (signl) ? s_signum_croak (signl) : 0;

        if (async->signum)
          {
            if (async->signum < 0)
              croak ("Async::Interrupt::new got passed illegal signal name or number: %s", SvPV_nolen (signl));

            sig_async [async->signum] = async;
            setsig (async->signum, async_sigsend);
          }
}

void
signal_hysteresis (async_t *async, int enable)
        CODE:
        async->hysteresis = enable;

void
signal_func (async_t *async)
        PPCODE:
        EXTEND (SP, 2);
        PUSHs (sv_2mortal (newSViv (PTR2IV (async_signal))));
        PUSHs (sv_2mortal (newSViv (PTR2IV (async))));

void
scope_block_func (SV *self)
        PPCODE:
        EXTEND (SP, 2);
        PUSHs (sv_2mortal (newSViv (PTR2IV (scope_block))));
        PUSHs (sv_2mortal (newSViv (PTR2IV (SvRV (self)))));

IV
c_var (async_t *async)
        CODE:
        RETVAL = PTR2IV (async->valuep);
        OUTPUT:
        RETVAL

void
handle (async_t *async)
        CODE:
        handle_async (async);

void
signal (async_t *async, int value = 1)
        CODE:
        async_signal (async, value);

void
block (async_t *async)
        CODE:
        block (async);

void
unblock (async_t *async)
        CODE:
        unblock (async);

void
scope_block (SV *self)
        CODE:
        scope_block (SvRV (self));

void
pipe_enable (async_t *async)
        ALIAS:
        pipe_enable  = 1
        pipe_disable = 0
        CODE:
        async->fd_enable = ix;

int
pipe_fileno (async_t *async)
        CODE:
        if (!async->ep.len)
          {
            int res;

            /*block (async);*//*TODO*/
            res = s_epipe_new (&async->ep);
            async->fd_enable = 1;
            /*unblock (async);*//*TODO*/

            if (res < 0)
              croak ("Async::Interrupt: unable to initialize event pipe");
          }

        RETVAL = async->ep.fd [0];
        OUTPUT:
        RETVAL

int
pipe_autodrain (async_t *async, int enable = -1)
        CODE:
        RETVAL = async->autodrain;
        if (enable >= 0)
          async->autodrain = enable;
        OUTPUT:
        RETVAL

void
pipe_drain (async_t *async)
        CODE:
        if (async->ep.len)
          s_epipe_drain (&async->ep);

void
post_fork (async_t *async)
        CODE:
        if (async->ep.len)
          {
            int res;

            /*block (async);*//*TODO*/
            res = s_epipe_renew (&async->ep);
            /*unblock (async);*//*TODO*/

            if (res < 0)
              croak ("Async::Interrupt: unable to initialize event pipe after fork");
          }

void
DESTROY (SV *self)
        CODE:
{
        int i;
        SV *async_sv = SvRV (self);
        async_t *async = SvASYNC_nrv (async_sv);

        for (i = AvFILLp (asyncs); i >= 0; --i)
          if (AvARRAY (asyncs)[i] == async_sv)
            {
              AvARRAY (asyncs)[i] = AvARRAY (asyncs)[AvFILLp (asyncs)];
              av_pop (asyncs);
              goto found;
            }

        if (!PL_dirty)
          warn ("Async::Interrupt::DESTROY could not find async object in list of asyncs, please report");

        found:

        if (async->signum)
          setsig (async->signum, SIG_DFL);

        if (!async->fh_r && async->ep.len)
          s_epipe_destroy (&async->ep);

        SvREFCNT_dec (async->fh_r);
        SvREFCNT_dec (async->fh_w);
        SvREFCNT_dec (async->cb);
        SvREFCNT_dec (async->value);

        Safefree (async);
}

SV *
sig2num (SV *signame_or_number)
        ALIAS:
        sig2num  = 0
        sig2name = 1
        PROTOTYPE: $
        CODE:
{
        int signum = s_signum (signame_or_number);

        if (signum < 0)
          RETVAL = &PL_sv_undef;
        else if (ix)
          RETVAL = newSVpv (PL_sig_name [signum], 0);
        else
          RETVAL = newSViv (signum);
}
        OUTPUT:
        RETVAL

MODULE = Async::Interrupt               PACKAGE = Async::Interrupt::EventPipe           PREFIX = s_epipe_

void
new (const char *klass)
        PPCODE:
{
        s_epipe *epp;

        Newz (0, epp, 1, s_epipe);
        XPUSHs (sv_setref_iv (sv_newmortal (), klass, PTR2IV (epp)));

        if (s_epipe_new (epp) < 0)
          croak ("Async::Interrupt::EventPipe: unable to create new event pipe");
}

void
filenos (s_epipe *epp)
        PPCODE:
        EXTEND (SP, 2);
        PUSHs (sv_2mortal (newSViv (epp->fd [0])));
        PUSHs (sv_2mortal (newSViv (epp->fd [1])));

int
fileno (s_epipe *epp)
        ALIAS:
        fileno   = 0
        fileno_r = 0
        fileno_w = 1
        CODE:
        RETVAL = epp->fd [ix];
        OUTPUT:
        RETVAL

int
type (s_epipe *epp)
        CODE:
        RETVAL = epp->len;
        OUTPUT:
        RETVAL

void
s_epipe_signal (s_epipe *epp)

void
s_epipe_drain (s_epipe *epp)

void
signal_func (s_epipe *epp)
        ALIAS:
        drain_func = 1
        PPCODE:
        EXTEND (SP, 2);
        PUSHs (sv_2mortal (newSViv (PTR2IV (ix ? s_epipe_drain : s_epipe_signal))));
        PUSHs (sv_2mortal (newSViv (PTR2IV (epp))));

void
s_epipe_wait (s_epipe *epp)

void
DESTROY (s_epipe *epp)
        CODE:
        s_epipe_destroy (epp);

Revision:	1.19
Committed:	Tue Apr 24 22:01:59 2012 UTC (12 years, 1 month ago) by root
Branch:	MAIN
CVS Tags:	rel-1_1
Changes since 1.18:	+31 -8 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include "EXTERN.h"
2			#include "perl.h"
3			#include "XSUB.h"
4
5	root	1.19	#include "ecb.h"
6	root	1.8	#include "schmorp.h"
7
8	root	1.1	typedef volatile sig_atomic_t atomic_t;
9
10			static int sig_pending, psig_pend; /* make local copies because of missing THX */
11			static Sighandler_t old_sighandler;
12			static atomic_t async_pending;
13
14	root	1.5	#define PERL_VERSION_ATLEAST(a,b,c) \
15			(PERL_REVISION > (a) \
16			\|\| (PERL_REVISION == (a) \
17			&& (PERL_VERSION > (b) \
18			\|\| (PERL_VERSION == (b) && PERL_SUBVERSION >= (c)))))
19
20			#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
21			# define HAS_SA_SIGINFO 1
22			#endif
23
24			#if !PERL_VERSION_ATLEAST(5,10,0)
25			# undef HAS_SA_SIGINFO
26			#endif
27
28	root	1.6	/*****************************************************************************/
29	root	1.1
30	root	1.6	typedef struct {
31	root	1.1	SV *cb;
32	root	1.2	void (c_cb)(pTHX_ void c_arg, int value);
33			void *c_arg;
34			SV fh_r, fh_w;
35	root	1.9	SV *value;
36	root	1.6	int signum;
37	root	1.11	int autodrain;
38	root	1.13	ANY *scope_savestack;
39	root	1.7	volatile int blocked;
40	root	1.1
41	root	1.9	s_epipe ep;
42	root	1.6	int fd_wlen;
43			atomic_t fd_enable;
44	root	1.2	atomic_t pending;
45	root	1.9	volatile IV *valuep;
46	root	1.13	atomic_t hysteresis;
47	root	1.6	} async_t;
48
49			static AV *asyncs;
50			static async_t *sig_async [SIG_SIZE];
51
52			#define SvASYNC_nrv(sv) INT2PTR (async_t *, SvIVX (sv))
53			#define SvASYNC(rv) SvASYNC_nrv (SvRV (rv))
54	root	1.1
55	root	1.13	static void async_signal (void *signal_arg, int value);
56
57			static void
58			setsig (int signum, void (*handler)(int))
59			{
60			#if _WIN32
61	root	1.17	signal (signum, handler);
62	root	1.13	#else
63			struct sigaction sa;
64			sa.sa_handler = handler;
65			sigfillset (&sa.sa_mask);
66			sa.sa_flags = 0; /* if we interrupt a syscall, we might drain the pipe before it became ready */
67			sigaction (signum, &sa, 0);
68	root	1.17	#endif
69	root	1.13	}
70
71			static void
72			async_sigsend (int signum)
73			{
74			async_signal (sig_async [signum], 0);
75			}
76
77	root	1.1	/* the main workhorse to signal */
78			static void
79			async_signal (void *signal_arg, int value)
80			{
81	root	1.6	static char pipedata [8];
82
83			async_t async = (async_t )signal_arg;
84	root	1.2	int pending = async->pending;
85	root	1.1
86	root	1.13	if (async->hysteresis)
87			setsig (async->signum, SIG_IGN);
88
89	root	1.9	*async->valuep = value ? value : 1;
90	root	1.19	ECB_MEMORY_FENCE_RELEASE;
91	root	1.2	async->pending = 1;
92	root	1.19	ECB_MEMORY_FENCE_RELEASE;
93	root	1.2	async_pending = 1;
94	root	1.19	ECB_MEMORY_FENCE_RELEASE;
95
96			if (!async->blocked)
97			{
98			psig_pend [9] = 1;
99			ECB_MEMORY_FENCE_RELEASE;
100			*sig_pending = 1;
101			ECB_MEMORY_FENCE_RELEASE;
102			}
103	root	1.1
104	root	1.10	if (!pending && async->fd_enable && async->ep.len)
105			s_epipe_signal (&async->ep);
106	root	1.2	}
107
108			static void
109	root	1.6	handle_async (async_t *async)
110	root	1.2	{
111			int old_errno = errno;
112	root	1.9	int value = *async->valuep;
113	root	1.2
114	root	1.9	*async->valuep = 0;
115	root	1.2	async->pending = 0;
116
117	root	1.13	/* restore signal */
118			if (async->hysteresis)
119			setsig (async->signum, async_sigsend);
120
121	root	1.2	/* drain pipe */
122	root	1.11	if (async->fd_enable && async->ep.len && async->autodrain)
123	root	1.9	s_epipe_drain (&async->ep);
124	root	1.2
125			if (async->c_cb)
126			{
127			dTHX;
128			async->c_cb (aTHX_ async->c_arg, value);
129			}
130
131			if (async->cb)
132			{
133			dSP;
134
135			SV *saveerr = SvOK (ERRSV) ? sv_mortalcopy (ERRSV) : 0;
136			SV *savedie = PL_diehook;
137
138			PL_diehook = 0;
139
140			PUSHSTACKi (PERLSI_SIGNAL);
141
142			PUSHMARK (SP);
143			XPUSHs (sv_2mortal (newSViv (value)));
144			PUTBACK;
145			call_sv (async->cb, G_VOID \| G_DISCARD \| G_EVAL);
146
147			if (SvTRUE (ERRSV))
148			{
149			SPAGAIN;
150
151			PUSHMARK (SP);
152			PUTBACK;
153			call_sv (get_sv ("Async::Interrupt::DIED", 1), G_VOID \| G_DISCARD \| G_EVAL \| G_KEEPERR);
154
155			sv_setpvn (ERRSV, "", 0);
156			}
157
158			if (saveerr)
159			sv_setsv (ERRSV, saveerr);
160	root	1.1
161	root	1.2	{
162			SV *oldhook = PL_diehook;
163			PL_diehook = savedie;
164			SvREFCNT_dec (oldhook);
165			}
166
167			POPSTACK;
168	root	1.1	}
169
170	root	1.2	errno = old_errno;
171	root	1.1	}
172
173			static void
174	root	1.2	handle_asyncs (void)
175	root	1.1	{
176	root	1.2	int i;
177
178	root	1.19	ECB_MEMORY_FENCE_ACQUIRE;
179
180	root	1.1	async_pending = 0;
181	root	1.2
182			for (i = AvFILLp (asyncs); i >= 0; --i)
183			{
184	root	1.12	SV *async_sv = AvARRAY (asyncs)[i];
185			async_t *async = SvASYNC_nrv (async_sv);
186	root	1.2
187			if (async->pending && !async->blocked)
188	root	1.12	{
189			/* temporarily keep a refcount */
190			SvREFCNT_inc (async_sv);
191			handle_async (async);
192			SvREFCNT_dec (async_sv);
193
194			/* the handler could have deleted any number of asyncs */
195			if (i > AvFILLp (asyncs))
196			i = AvFILLp (asyncs);
197			}
198	root	1.2	}
199	root	1.1	}
200
201	root	1.5	#if HAS_SA_SIGINFO
202	root	1.1	static Signal_t async_sighandler (int signum, siginfo_t si, void sarg)
203			{
204			if (signum == 9)
205	root	1.2	handle_asyncs ();
206	root	1.1	else
207			old_sighandler (signum, si, sarg);
208			}
209			#else
210	root	1.3	static Signal_t async_sighandler (int signum)
211	root	1.1	{
212			if (signum == 9)
213	root	1.3	handle_asyncs ();
214	root	1.1	else
215			old_sighandler (signum);
216			}
217			#endif
218
219	root	1.7	#define block(async) ++(async)->blocked
220
221	root	1.6	static void
222	root	1.7	unblock (async_t *async)
223	root	1.4	{
224			--async->blocked;
225			if (async->pending && !async->blocked)
226			handle_async (async);
227	root	1.7	}
228	root	1.4
229	root	1.7	static void
230			scope_block_cb (pTHX_ void *async_sv)
231			{
232			async_t async = SvASYNC_nrv ((SV )async_sv);
233	root	1.13
234			async->scope_savestack = 0;
235	root	1.7	unblock (async);
236	root	1.4	SvREFCNT_dec (async_sv);
237			}
238	root	1.1
239	root	1.13	static void
240			scope_block (SV *async_sv)
241			{
242			async_t *async = SvASYNC_nrv (async_sv);
243
244			/* as a heuristic, we skip the scope block if we already are blocked */
245			/* and the existing scope block used the same savestack */
246
247			if (!async->scope_savestack \|\| async->scope_savestack != PL_savestack)
248			{
249			async->scope_savestack = PL_savestack;
250			block (async);
251
252			LEAVE; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */
253			SAVEDESTRUCTOR_X (scope_block_cb, (void *)SvREFCNT_inc (async_sv));
254			ENTER; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */
255			}
256			}
257
258	root	1.1	MODULE = Async::Interrupt PACKAGE = Async::Interrupt
259
260			BOOT:
261			old_sighandler = PL_sighandlerp;
262			PL_sighandlerp = async_sighandler;
263			sig_pending = &PL_sig_pending;
264			psig_pend = PL_psig_pend;
265			asyncs = newAV ();
266	root	1.4	CvNODEBUG_on (get_cv ("Async::Interrupt::scope_block", 0)); /* otherwise calling scope can be the debugger */
267	root	1.1
268	root	1.3	PROTOTYPES: DISABLE
269
270	root	1.6	void
271	root	1.9	_alloc (SV cb, void c_cb, void c_arg, SV fh_r, SV fh_w, SV signl, SV *pvalue)
272	root	1.6	PPCODE:
273	root	1.1	{
274	root	1.8	SV *cv = SvOK (cb) ? SvREFCNT_inc (s_get_cv_croak (cb)) : 0;
275	root	1.19	async_t *async;
276	root	1.1
277	root	1.6	Newz (0, async, 1, async_t);
278	root	1.1
279	root	1.6	XPUSHs (sv_2mortal (newSViv (PTR2IV (async))));
280	root	1.9	/* TODO: need to bless right now to ensure deallocation */
281	root	1.6	av_push (asyncs, TOPs);
282	root	1.2
283	root	1.9	SvGETMAGIC (fh_r); SvGETMAGIC (fh_w);
284			if (SvOK (fh_r) \|\| SvOK (fh_w))
285			{
286			int fd_r = s_fileno_croak (fh_r, 0);
287			int fd_w = s_fileno_croak (fh_w, 1);
288
289			async->fh_r = newSVsv (fh_r);
290			async->fh_w = newSVsv (fh_w);
291			async->ep.fd [0] = fd_r;
292			async->ep.fd [1] = fd_w;
293			async->ep.len = 1;
294			async->fd_enable = 1;
295			}
296
297			async->value = SvROK (pvalue)
298			? SvREFCNT_inc_NN (SvRV (pvalue))
299			: NEWSV (0, 0);
300
301			sv_setiv (async->value, 0);
302			SvIOK_only (async->value); /* just to be sure */
303			SvREADONLY_on (async->value);
304
305			async->valuep = &(SvIVX (async->value));
306
307	root	1.11	async->autodrain = 1;
308	root	1.6	async->cb = cv;
309			async->c_cb = c_cb;
310			async->c_arg = c_arg;
311	root	1.8	async->signum = SvOK (signl) ? s_signum_croak (signl) : 0;
312	root	1.6
313			if (async->signum)
314			{
315			if (async->signum < 0)
316			croak ("Async::Interrupt::new got passed illegal signal name or number: %s", SvPV_nolen (signl));
317
318			sig_async [async->signum] = async;
319	root	1.13	setsig (async->signum, async_sigsend);
320	root	1.6	}
321	root	1.1	}
322
323			void
324	root	1.13	signal_hysteresis (async_t *async, int enable)
325			CODE:
326			async->hysteresis = enable;
327
328			void
329	root	1.6	signal_func (async_t *async)
330	root	1.1	PPCODE:
331			EXTEND (SP, 2);
332			PUSHs (sv_2mortal (newSViv (PTR2IV (async_signal))));
333	root	1.6	PUSHs (sv_2mortal (newSViv (PTR2IV (async))));
334	root	1.1
335	root	1.13	void
336			scope_block_func (SV *self)
337			PPCODE:
338			EXTEND (SP, 2);
339			PUSHs (sv_2mortal (newSViv (PTR2IV (scope_block))));
340			PUSHs (sv_2mortal (newSViv (PTR2IV (SvRV (self)))));
341
342	root	1.9	IV
343			c_var (async_t *async)
344			CODE:
345			RETVAL = PTR2IV (async->valuep);
346			OUTPUT:
347			RETVAL
348
349	root	1.1	void
350	root	1.19	handle (async_t *async)
351			CODE:
352			handle_async (async);
353
354			void
355	root	1.9	signal (async_t *async, int value = 1)
356	root	1.1	CODE:
357	root	1.6	async_signal (async, value);
358	root	1.2
359			void
360	root	1.6	block (async_t *async)
361	root	1.2	CODE:
362	root	1.7	block (async);
363	root	1.2
364			void
365	root	1.6	unblock (async_t *async)
366	root	1.2	CODE:
367	root	1.7	unblock (async);
368	root	1.1
369			void
370	root	1.4	scope_block (SV *self)
371			CODE:
372	root	1.13	scope_block (SvRV (self));
373	root	1.4
374			void
375	root	1.6	pipe_enable (async_t *async)
376			ALIAS:
377	root	1.19	pipe_enable = 1
378	root	1.6	pipe_disable = 0
379			CODE:
380			async->fd_enable = ix;
381
382	root	1.9	int
383			pipe_fileno (async_t *async)
384			CODE:
385			if (!async->ep.len)
386			{
387			int res;
388
389			/block (async);//TODO/
390			res = s_epipe_new (&async->ep);
391			async->fd_enable = 1;
392			/unblock (async);//TODO/
393
394			if (res < 0)
395			croak ("Async::Interrupt: unable to initialize event pipe");
396			}
397
398			RETVAL = async->ep.fd [0];
399			OUTPUT:
400			RETVAL
401
402	root	1.11	int
403			pipe_autodrain (async_t *async, int enable = -1)
404			CODE:
405			RETVAL = async->autodrain;
406			if (enable >= 0)
407			async->autodrain = enable;
408			OUTPUT:
409			RETVAL
410	root	1.9
411			void
412	root	1.19	pipe_drain (async_t *async)
413			CODE:
414			if (async->ep.len)
415			s_epipe_drain (&async->ep);
416
417			void
418	root	1.9	post_fork (async_t *async)
419			CODE:
420			if (async->ep.len)
421			{
422	root	1.19	int res;
423	root	1.9
424			/block (async);//TODO/
425			res = s_epipe_renew (&async->ep);
426			/unblock (async);//TODO/
427
428			if (res < 0)
429			croak ("Async::Interrupt: unable to initialize event pipe after fork");
430			}
431
432	root	1.6	void
433	root	1.1	DESTROY (SV *self)
434			CODE:
435			{
436	root	1.19	int i;
437			SV *async_sv = SvRV (self);
438			async_t *async = SvASYNC_nrv (async_sv);
439	root	1.1
440	root	1.2	for (i = AvFILLp (asyncs); i >= 0; --i)
441	root	1.1	if (AvARRAY (asyncs)[i] == async_sv)
442			{
443	root	1.12	AvARRAY (asyncs)[i] = AvARRAY (asyncs)[AvFILLp (asyncs)];
444			av_pop (asyncs);
445	root	1.1	goto found;
446			}
447
448			if (!PL_dirty)
449	root	1.2	warn ("Async::Interrupt::DESTROY could not find async object in list of asyncs, please report");
450	root	1.1
451			found:
452	root	1.6
453			if (async->signum)
454	root	1.13	setsig (async->signum, SIG_DFL);
455	root	1.6
456	root	1.9	if (!async->fh_r && async->ep.len)
457			s_epipe_destroy (&async->ep);
458
459	root	1.2	SvREFCNT_dec (async->fh_r);
460			SvREFCNT_dec (async->fh_w);
461	root	1.1	SvREFCNT_dec (async->cb);
462	root	1.9	SvREFCNT_dec (async->value);
463	root	1.1
464			Safefree (async);
465			}
466
467	root	1.14	SV *
468			sig2num (SV *signame_or_number)
469			ALIAS:
470			sig2num = 0
471			sig2name = 1
472	root	1.16	PROTOTYPE: $
473	root	1.14	CODE:
474			{
475			int signum = s_signum (signame_or_number);
476
477			if (signum < 0)
478			RETVAL = &PL_sv_undef;
479			else if (ix)
480			RETVAL = newSVpv (PL_sig_name [signum], 0);
481			else
482			RETVAL = newSViv (signum);
483			}
484			OUTPUT:
485			RETVAL
486
487	root	1.11	MODULE = Async::Interrupt PACKAGE = Async::Interrupt::EventPipe PREFIX = s_epipe_
488
489			void
490			new (const char *klass)
491			PPCODE:
492			{
493			s_epipe *epp;
494
495			Newz (0, epp, 1, s_epipe);
496			XPUSHs (sv_setref_iv (sv_newmortal (), klass, PTR2IV (epp)));
497
498			if (s_epipe_new (epp) < 0)
499			croak ("Async::Interrupt::EventPipe: unable to create new event pipe");
500			}
501
502			void
503			filenos (s_epipe *epp)
504			PPCODE:
505			EXTEND (SP, 2);
506			PUSHs (sv_2mortal (newSViv (epp->fd [0])));
507			PUSHs (sv_2mortal (newSViv (epp->fd [1])));
508
509			int
510			fileno (s_epipe *epp)
511			ALIAS:
512			fileno = 0
513			fileno_r = 0
514			fileno_w = 1
515			CODE:
516			RETVAL = epp->fd [ix];
517			OUTPUT:
518			RETVAL
519
520			int
521			type (s_epipe *epp)
522			CODE:
523			RETVAL = epp->len;
524			OUTPUT:
525			RETVAL
526
527			void
528			s_epipe_signal (s_epipe *epp)
529
530			void
531			s_epipe_drain (s_epipe *epp)
532
533			void
534	root	1.18	signal_func (s_epipe *epp)
535			ALIAS:
536			drain_func = 1
537	root	1.15	PPCODE:
538			EXTEND (SP, 2);
539	root	1.18	PUSHs (sv_2mortal (newSViv (PTR2IV (ix ? s_epipe_drain : s_epipe_signal))));
540	root	1.15	PUSHs (sv_2mortal (newSViv (PTR2IV (epp))));
541
542			void
543			s_epipe_wait (s_epipe *epp)
544
545			void
546	root	1.11	DESTROY (s_epipe *epp)
547			CODE:
548			s_epipe_destroy (epp);
549