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/* |
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* libetp implementation |
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* |
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* Copyright (c) 2007,2008,2009,2010,2011,2012,2013 Marc Alexander Lehmann <libetp@schmorp.de> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* the GNU General Public License ("GPL") version 2 or any later version, |
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* in which case the provisions of the GPL are applicable instead of |
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* the above. If you wish to allow the use of your version of this file |
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* only under the terms of the GPL and not to allow others to use your |
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* version of this file under the BSD license, indicate your decision |
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* by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL. If you do not delete the |
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* provisions above, a recipient may use your version of this file under |
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* either the BSD or the GPL. |
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*/ |
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#ifndef ETP_API_DECL |
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# define ETP_API_DECL static |
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#endif |
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#ifndef ETP_PRI_MIN |
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# define ETP_PRI_MIN 0 |
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# define ETP_PRI_MAX 0 |
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#endif |
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#ifndef ETP_TYPE_QUIT |
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# define ETP_TYPE_QUIT 0 |
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#endif |
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#ifndef ETP_TYPE_GROUP |
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# define ETP_TYPE_GROUP 1 |
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#endif |
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#define ETP_NUM_PRI (ETP_PRI_MAX - ETP_PRI_MIN + 1) |
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#define ETP_TICKS ((1000000 + 1023) >> 10) |
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/* calculate time difference in ~1/ETP_TICKS of a second */ |
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ecb_inline int |
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etp_tvdiff (struct timeval *tv1, struct timeval *tv2) |
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{ |
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return (tv2->tv_sec - tv1->tv_sec ) * ETP_TICKS |
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+ ((tv2->tv_usec - tv1->tv_usec) >> 10); |
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} |
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static unsigned int started, idle, wanted = 4; |
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static void (*want_poll_cb) (void); |
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static void (*done_poll_cb) (void); |
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static unsigned int max_poll_time; /* reslock */ |
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static unsigned int max_poll_reqs; /* reslock */ |
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static unsigned int nreqs; /* reqlock */ |
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static unsigned int nready; /* reqlock */ |
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static unsigned int npending; /* reqlock */ |
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static unsigned int max_idle = 4; /* maximum number of threads that can idle indefinitely */ |
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static unsigned int idle_timeout = 10; /* number of seconds after which an idle threads exit */ |
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static xmutex_t wrklock; |
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static xmutex_t reslock; |
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static xmutex_t reqlock; |
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static xcond_t reqwait; |
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root |
1.3 |
struct etp_tmpbuf |
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{ |
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void *ptr; |
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int len; |
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}; |
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static void * |
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etp_tmpbuf_get (struct etp_tmpbuf *buf, int len) |
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{ |
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if (buf->len < len) |
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{ |
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free (buf->ptr); |
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buf->ptr = malloc (buf->len = len); |
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} |
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return buf->ptr; |
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} |
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root |
1.1 |
typedef struct etp_worker |
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{ |
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root |
1.3 |
struct etp_tmpbuf tmpbuf; |
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root |
1.1 |
|
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/* locked by wrklock */ |
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struct etp_worker *prev, *next; |
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xthread_t tid; |
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#ifdef ETP_WORKER_COMMON |
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ETP_WORKER_COMMON |
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#endif |
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} etp_worker; |
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static etp_worker wrk_first; /* NOT etp */ |
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#define ETP_WORKER_LOCK(wrk) X_LOCK (wrklock) |
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#define ETP_WORKER_UNLOCK(wrk) X_UNLOCK (wrklock) |
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/* worker threads management */ |
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static void |
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etp_worker_clear (etp_worker *wrk) |
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{ |
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} |
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static void ecb_cold |
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etp_worker_free (etp_worker *wrk) |
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{ |
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free (wrk->tmpbuf.ptr); |
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wrk->next->prev = wrk->prev; |
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wrk->prev->next = wrk->next; |
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free (wrk); |
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} |
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ETP_API_DECL unsigned int |
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etp_nreqs (void) |
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{ |
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int retval; |
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if (WORDACCESS_UNSAFE) X_LOCK (reqlock); |
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retval = nreqs; |
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if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); |
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return retval; |
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} |
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ETP_API_DECL unsigned int |
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etp_nready (void) |
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{ |
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unsigned int retval; |
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if (WORDACCESS_UNSAFE) X_LOCK (reqlock); |
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retval = nready; |
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if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); |
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return retval; |
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} |
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ETP_API_DECL unsigned int |
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etp_npending (void) |
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{ |
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unsigned int retval; |
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if (WORDACCESS_UNSAFE) X_LOCK (reqlock); |
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retval = npending; |
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if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); |
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return retval; |
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} |
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ETP_API_DECL unsigned int |
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etp_nthreads (void) |
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{ |
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unsigned int retval; |
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if (WORDACCESS_UNSAFE) X_LOCK (reqlock); |
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retval = started; |
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if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); |
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return retval; |
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} |
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/* |
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* a somewhat faster data structure might be nice, but |
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* with 8 priorities this actually needs <20 insns |
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* per shift, the most expensive operation. |
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*/ |
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typedef struct { |
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ETP_REQ *qs[ETP_NUM_PRI], *qe[ETP_NUM_PRI]; /* qstart, qend */ |
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int size; |
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} etp_reqq; |
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static etp_reqq req_queue; |
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static etp_reqq res_queue; |
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static void ecb_noinline ecb_cold |
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reqq_init (etp_reqq *q) |
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{ |
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int pri; |
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for (pri = 0; pri < ETP_NUM_PRI; ++pri) |
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q->qs[pri] = q->qe[pri] = 0; |
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q->size = 0; |
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} |
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static int ecb_noinline |
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reqq_push (etp_reqq *q, ETP_REQ *req) |
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{ |
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int pri = req->pri; |
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req->next = 0; |
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if (q->qe[pri]) |
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{ |
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q->qe[pri]->next = req; |
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q->qe[pri] = req; |
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} |
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else |
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q->qe[pri] = q->qs[pri] = req; |
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return q->size++; |
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} |
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static ETP_REQ * ecb_noinline |
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reqq_shift (etp_reqq *q) |
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{ |
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int pri; |
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if (!q->size) |
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return 0; |
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--q->size; |
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for (pri = ETP_NUM_PRI; pri--; ) |
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{ |
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root |
1.2 |
ETP_REQ *req = q->qs[pri]; |
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1.1 |
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if (req) |
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{ |
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root |
1.2 |
if (!(q->qs[pri] = (ETP_REQ *)req->next)) |
247 |
root |
1.1 |
q->qe[pri] = 0; |
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return req; |
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} |
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} |
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abort (); |
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} |
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ETP_API_DECL int ecb_cold |
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etp_init (void (*want_poll)(void), void (*done_poll)(void)) |
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{ |
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X_MUTEX_CREATE (wrklock); |
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X_MUTEX_CREATE (reslock); |
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X_MUTEX_CREATE (reqlock); |
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X_COND_CREATE (reqwait); |
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reqq_init (&req_queue); |
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reqq_init (&res_queue); |
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wrk_first.next = |
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wrk_first.prev = &wrk_first; |
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started = 0; |
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idle = 0; |
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nreqs = 0; |
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nready = 0; |
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npending = 0; |
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want_poll_cb = want_poll; |
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done_poll_cb = done_poll; |
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return 0; |
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} |
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/* not yet in etp.c */ |
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X_THREAD_PROC (etp_proc); |
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static void ecb_cold |
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etp_start_thread (void) |
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{ |
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etp_worker *wrk = calloc (1, sizeof (etp_worker)); |
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/*TODO*/ |
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assert (("unable to allocate worker thread data", wrk)); |
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X_LOCK (wrklock); |
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if (xthread_create (&wrk->tid, etp_proc, (void *)wrk)) |
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{ |
297 |
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wrk->prev = &wrk_first; |
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wrk->next = wrk_first.next; |
299 |
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wrk_first.next->prev = wrk; |
300 |
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wrk_first.next = wrk; |
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++started; |
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} |
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else |
304 |
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free (wrk); |
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306 |
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X_UNLOCK (wrklock); |
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} |
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static void |
310 |
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etp_maybe_start_thread (void) |
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{ |
312 |
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if (ecb_expect_true (etp_nthreads () >= wanted)) |
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return; |
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/* todo: maybe use idle here, but might be less exact */ |
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if (ecb_expect_true (0 <= (int)etp_nthreads () + (int)etp_npending () - (int)etp_nreqs ())) |
317 |
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return; |
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319 |
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etp_start_thread (); |
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} |
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322 |
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static void ecb_cold |
323 |
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etp_end_thread (void) |
324 |
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{ |
325 |
root |
1.2 |
ETP_REQ *req = calloc (1, sizeof (ETP_REQ)); /* will be freed by worker */ |
326 |
root |
1.1 |
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327 |
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req->type = ETP_TYPE_QUIT; |
328 |
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req->pri = ETP_PRI_MAX - ETP_PRI_MIN; |
329 |
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330 |
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X_LOCK (reqlock); |
331 |
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reqq_push (&req_queue, req); |
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X_COND_SIGNAL (reqwait); |
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X_UNLOCK (reqlock); |
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335 |
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X_LOCK (wrklock); |
336 |
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--started; |
337 |
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X_UNLOCK (wrklock); |
338 |
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} |
339 |
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340 |
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ETP_API_DECL int |
341 |
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etp_poll (void) |
342 |
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{ |
343 |
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unsigned int maxreqs; |
344 |
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unsigned int maxtime; |
345 |
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struct timeval tv_start, tv_now; |
346 |
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347 |
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X_LOCK (reslock); |
348 |
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maxreqs = max_poll_reqs; |
349 |
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maxtime = max_poll_time; |
350 |
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X_UNLOCK (reslock); |
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352 |
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if (maxtime) |
353 |
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gettimeofday (&tv_start, 0); |
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355 |
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for (;;) |
356 |
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{ |
357 |
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ETP_REQ *req; |
358 |
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359 |
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etp_maybe_start_thread (); |
360 |
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361 |
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X_LOCK (reslock); |
362 |
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req = reqq_shift (&res_queue); |
363 |
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364 |
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if (req) |
365 |
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{ |
366 |
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--npending; |
367 |
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368 |
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if (!res_queue.size && done_poll_cb) |
369 |
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done_poll_cb (); |
370 |
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} |
371 |
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372 |
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X_UNLOCK (reslock); |
373 |
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374 |
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if (!req) |
375 |
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return 0; |
376 |
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377 |
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X_LOCK (reqlock); |
378 |
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--nreqs; |
379 |
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X_UNLOCK (reqlock); |
380 |
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381 |
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if (ecb_expect_false (req->type == ETP_TYPE_GROUP && req->size)) |
382 |
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{ |
383 |
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req->int1 = 1; /* mark request as delayed */ |
384 |
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continue; |
385 |
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} |
386 |
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else |
387 |
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{ |
388 |
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int res = ETP_FINISH (req); |
389 |
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if (ecb_expect_false (res)) |
390 |
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return res; |
391 |
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} |
392 |
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393 |
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if (ecb_expect_false (maxreqs && !--maxreqs)) |
394 |
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break; |
395 |
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396 |
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if (maxtime) |
397 |
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{ |
398 |
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gettimeofday (&tv_now, 0); |
399 |
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400 |
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if (etp_tvdiff (&tv_start, &tv_now) >= maxtime) |
401 |
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break; |
402 |
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} |
403 |
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} |
404 |
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405 |
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errno = EAGAIN; |
406 |
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return -1; |
407 |
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} |
408 |
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409 |
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ETP_API_DECL void |
410 |
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etp_grp_cancel (ETP_REQ *grp); |
411 |
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412 |
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ETP_API_DECL void |
413 |
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etp_cancel (ETP_REQ *req) |
414 |
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{ |
415 |
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req->cancelled = 1; |
416 |
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417 |
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etp_grp_cancel (req); |
418 |
|
|
} |
419 |
|
|
|
420 |
|
|
ETP_API_DECL void |
421 |
|
|
etp_grp_cancel (ETP_REQ *grp) |
422 |
|
|
{ |
423 |
|
|
for (grp = grp->grp_first; grp; grp = grp->grp_next) |
424 |
|
|
etp_cancel (grp); |
425 |
|
|
} |
426 |
|
|
|
427 |
|
|
ETP_API_DECL void |
428 |
|
|
etp_submit (ETP_REQ *req) |
429 |
|
|
{ |
430 |
|
|
req->pri -= ETP_PRI_MIN; |
431 |
|
|
|
432 |
|
|
if (ecb_expect_false (req->pri < ETP_PRI_MIN - ETP_PRI_MIN)) req->pri = ETP_PRI_MIN - ETP_PRI_MIN; |
433 |
|
|
if (ecb_expect_false (req->pri > ETP_PRI_MAX - ETP_PRI_MIN)) req->pri = ETP_PRI_MAX - ETP_PRI_MIN; |
434 |
|
|
|
435 |
|
|
if (ecb_expect_false (req->type == ETP_TYPE_GROUP)) |
436 |
|
|
{ |
437 |
|
|
/* I hope this is worth it :/ */ |
438 |
|
|
X_LOCK (reqlock); |
439 |
|
|
++nreqs; |
440 |
|
|
X_UNLOCK (reqlock); |
441 |
|
|
|
442 |
|
|
X_LOCK (reslock); |
443 |
|
|
|
444 |
|
|
++npending; |
445 |
|
|
|
446 |
|
|
if (!reqq_push (&res_queue, req) && want_poll_cb) |
447 |
|
|
want_poll_cb (); |
448 |
|
|
|
449 |
|
|
X_UNLOCK (reslock); |
450 |
|
|
} |
451 |
|
|
else |
452 |
|
|
{ |
453 |
|
|
X_LOCK (reqlock); |
454 |
|
|
++nreqs; |
455 |
|
|
++nready; |
456 |
|
|
reqq_push (&req_queue, req); |
457 |
|
|
X_COND_SIGNAL (reqwait); |
458 |
|
|
X_UNLOCK (reqlock); |
459 |
|
|
|
460 |
|
|
etp_maybe_start_thread (); |
461 |
|
|
} |
462 |
|
|
} |
463 |
|
|
|
464 |
|
|
ETP_API_DECL void ecb_cold |
465 |
|
|
etp_set_max_poll_time (double nseconds) |
466 |
|
|
{ |
467 |
|
|
if (WORDACCESS_UNSAFE) X_LOCK (reslock); |
468 |
|
|
max_poll_time = nseconds * ETP_TICKS; |
469 |
|
|
if (WORDACCESS_UNSAFE) X_UNLOCK (reslock); |
470 |
|
|
} |
471 |
|
|
|
472 |
|
|
ETP_API_DECL void ecb_cold |
473 |
|
|
etp_set_max_poll_reqs (unsigned int maxreqs) |
474 |
|
|
{ |
475 |
|
|
if (WORDACCESS_UNSAFE) X_LOCK (reslock); |
476 |
|
|
max_poll_reqs = maxreqs; |
477 |
|
|
if (WORDACCESS_UNSAFE) X_UNLOCK (reslock); |
478 |
|
|
} |
479 |
|
|
|
480 |
|
|
ETP_API_DECL void ecb_cold |
481 |
|
|
etp_set_max_idle (unsigned int nthreads) |
482 |
|
|
{ |
483 |
|
|
if (WORDACCESS_UNSAFE) X_LOCK (reqlock); |
484 |
|
|
max_idle = nthreads; |
485 |
|
|
if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); |
486 |
|
|
} |
487 |
|
|
|
488 |
|
|
ETP_API_DECL void ecb_cold |
489 |
|
|
etp_set_idle_timeout (unsigned int seconds) |
490 |
|
|
{ |
491 |
|
|
if (WORDACCESS_UNSAFE) X_LOCK (reqlock); |
492 |
|
|
idle_timeout = seconds; |
493 |
|
|
if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); |
494 |
|
|
} |
495 |
|
|
|
496 |
|
|
ETP_API_DECL void ecb_cold |
497 |
|
|
etp_set_min_parallel (unsigned int nthreads) |
498 |
|
|
{ |
499 |
|
|
if (wanted < nthreads) |
500 |
|
|
wanted = nthreads; |
501 |
|
|
} |
502 |
|
|
|
503 |
|
|
ETP_API_DECL void ecb_cold |
504 |
|
|
etp_set_max_parallel (unsigned int nthreads) |
505 |
|
|
{ |
506 |
|
|
if (wanted > nthreads) |
507 |
|
|
wanted = nthreads; |
508 |
|
|
|
509 |
|
|
while (started > wanted) |
510 |
|
|
etp_end_thread (); |
511 |
|
|
} |
512 |
|
|
|