| | varnish-cache/bin/varnishd/common/common_vsc.c |
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/*- |
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* Copyright (c) 2006 Verdens Gang AS |
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* Copyright (c) 2006-2015 Varnish Software AS |
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* All rights reserved. |
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* |
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* Author: Poul-Henning Kamp <phk@phk.freebsd.dk> |
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* |
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* SPDX-License-Identifier: BSD-2-Clause |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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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 AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include <stdarg.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include "vdef.h" |
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#include "vrt.h" |
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#include "miniobj.h" |
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#include "vas.h" |
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#include "vmb.h" |
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#include "vsc_priv.h" |
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#include "vqueue.h" |
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#include "heritage.h" |
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#include "vsmw.h" |
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/*--------------------------------------------------------------------*/ |
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struct vsc_seg { |
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unsigned magic; |
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#define VSC_SEG_MAGIC 0x9b355991 |
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struct vsmw *vsm; // keep master/child sep. |
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const char *nm; |
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VTAILQ_ENTRY(vsc_seg) list; |
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void *seg; |
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/* VSC segments */ |
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struct vsc_head *head; |
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void *ptr; |
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struct vsc_seg *doc; |
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/* DOC segments */ |
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const unsigned char *jp; |
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int refs; |
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}; |
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static VTAILQ_HEAD(,vsc_seg) vsc_seglist = |
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VTAILQ_HEAD_INITIALIZER(vsc_seglist); |
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static void v_matchproto_(vsm_lock_f) |
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vsc_dummy_lock(void) |
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{ |
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} |
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vsm_lock_f *vsc_lock = vsc_dummy_lock; |
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vsm_lock_f *vsc_unlock = vsc_dummy_lock; |
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static const size_t vsc_overhead = PRNDUP(sizeof(struct vsc_head)); |
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static struct vsc_seg * |
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vrt_vsc_mksegv(struct vsmw_cluster *vc, const char *category, |
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size_t payload, const char *fmt, va_list va) |
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{ |
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struct vsc_seg *vsg; |
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852011 |
ALLOC_OBJ(vsg, VSC_SEG_MAGIC); |
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AN(vsg); |
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vsg->seg = VSMW_Allocv(heritage.proc_vsmw, vc, category, |
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VRT_VSC_Overhead(payload), fmt, va); |
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AN(vsg->seg); |
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vsg->vsm = heritage.proc_vsmw; |
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vsg->head = (void*)vsg->seg; |
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vsg->head->body_offset = vsc_overhead; |
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vsg->ptr = (char*)vsg->seg + vsc_overhead; |
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return (vsg); |
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} |
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static struct vsc_seg * |
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vrt_vsc_mksegf(const char *category, size_t payload, const char *fmt, ...) |
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{ |
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va_list ap; |
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struct vsc_seg *vsg; |
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va_start(ap, fmt); |
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vsg = vrt_vsc_mksegv(NULL, category, payload, fmt, ap); |
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va_end(ap); |
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return (vsg); |
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} |
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size_t |
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VRT_VSC_Overhead(size_t payload) |
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{ |
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return (vsc_overhead + PRNDUP(payload)); |
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} |
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void |
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VRT_VSC_Hide(const struct vsc_seg *vsg) |
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{ |
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CHECK_OBJ_NOTNULL(vsg, VSC_SEG_MAGIC); |
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assert(vsg->head->ready > 0); |
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vsg->head->ready = 2; |
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} |
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void |
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VRT_VSC_Reveal(const struct vsc_seg *vsg) |
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{ |
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CHECK_OBJ_NOTNULL(vsg, VSC_SEG_MAGIC); |
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assert(vsg->head->ready > 0); |
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vsg->head->ready = 1; |
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} |
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void * |
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VRT_VSC_Alloc(struct vsmw_cluster *vc, struct vsc_seg **sg, |
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const char *nm, size_t sd, |
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const unsigned char *jp, size_t sj, const char *fmt, va_list va) |
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{ |
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struct vsc_seg *vsg, *dvsg; |
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char buf[1024]; |
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uintptr_t jjp; |
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vsc_lock(); |
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jjp = (uintptr_t)jp; |
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VTAILQ_FOREACH(dvsg, &vsc_seglist, list) { |
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if (dvsg->vsm != heritage.proc_vsmw) |
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continue; |
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if (dvsg->jp == NULL || dvsg->jp == jp) |
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break; |
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} |
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if (dvsg == NULL || dvsg->jp == NULL) { |
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/* Create a new documentation segment */ |
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dvsg = vrt_vsc_mksegf(VSC_DOC_CLASS, sj, |
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"%jx", (uintmax_t)jjp); |
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AN(dvsg); |
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dvsg->jp = jp; |
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dvsg->head->doc_id = jjp; |
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memcpy(dvsg->ptr, jp, sj); |
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VWMB(); |
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dvsg->head->ready = 1; |
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VTAILQ_INSERT_HEAD(&vsc_seglist, dvsg, list); |
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} |
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AN(dvsg); |
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dvsg->refs++; |
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if (*fmt == '\0') |
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bprintf(buf, "%s", nm); |
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else |
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bprintf(buf, "%s.%s", nm, fmt); |
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AN(heritage.proc_vsmw); |
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vsg = vrt_vsc_mksegv(vc, VSC_CLASS, sd, buf, va); |
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AN(vsg); |
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vsg->nm = nm; |
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vsg->doc = dvsg; |
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vsg->head->doc_id = jjp; |
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VTAILQ_INSERT_TAIL(&vsc_seglist, vsg, list); |
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VWMB(); |
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vsg->head->ready = 1; |
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vsc_unlock(); |
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if (sg != NULL) |
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*sg = vsg; |
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return (vsg->ptr); |
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} |
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void |
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VRT_VSC_Destroy(const char *nm, struct vsc_seg *vsg) |
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{ |
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struct vsc_seg *dvsg; |
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vsc_lock(); |
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AN(heritage.proc_vsmw); |
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CHECK_OBJ_NOTNULL(vsg, VSC_SEG_MAGIC); |
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CAST_OBJ_NOTNULL(dvsg, vsg->doc, VSC_SEG_MAGIC); |
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AZ(vsg->jp); |
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assert(vsg->vsm == heritage.proc_vsmw); |
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assert(vsg->nm == nm); |
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VSMW_Free(heritage.proc_vsmw, &vsg->seg); |
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VTAILQ_REMOVE(&vsc_seglist, vsg, list); |
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FREE_OBJ(vsg); |
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if (--dvsg->refs == 0) { |
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VSMW_Free(heritage.proc_vsmw, &dvsg->seg); |
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VTAILQ_REMOVE(&vsc_seglist, dvsg, list); |
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FREE_OBJ(dvsg); |
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} |
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vsc_unlock(); |
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} |