[4232] | 1 | //memlock.c: |
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| 2 | |
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| 3 | /* |
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[5381] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2012 |
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[4232] | 5 | * |
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| 6 | * This file is part of roard a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * RoarAudio is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | #include "roard.h" |
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| 27 | |
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[4234] | 28 | #define MAX_SEGMENTS 16 |
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| 29 | |
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| 30 | struct memlock { |
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| 31 | int level; |
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| 32 | void * addr; |
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| 33 | size_t len; |
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| 34 | }; |
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| 35 | |
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| 36 | static struct memlock memlock_table[MAX_SEGMENTS]; |
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| 37 | |
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| 38 | static volatile int memlock_table_inited = 0; |
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| 39 | |
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| 40 | static void memlock_table_init (void) { |
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| 41 | if ( memlock_table_inited ) |
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| 42 | return; |
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| 43 | |
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| 44 | memset(memlock_table, 0, sizeof(memlock_table)); |
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| 45 | |
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| 46 | memlock_table_inited = 1; |
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| 47 | |
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| 48 | memlock_register(MEMLOCK_MEDIUM, memlock_table, sizeof(memlock_table)); |
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[4251] | 49 | |
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| 50 | memlock_register(MEMLOCK_MEDIUM, g_clients, sizeof(g_clients)); |
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| 51 | memlock_register(MEMLOCK_MEDIUM, g_streams, sizeof(g_streams)); |
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| 52 | |
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| 53 | memlock_register(MEMLOCK_HIGH, g_listen, sizeof(g_listen)); |
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| 54 | memlock_register(MEMLOCK_HIGH, &g_counters, sizeof(g_counters)); |
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[4234] | 55 | } |
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| 56 | |
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| 57 | int memlock_register(int level, void * addr, size_t len) { |
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| 58 | int i; |
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| 59 | |
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| 60 | if ( !memlock_table_inited ) |
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| 61 | memlock_table_init(); |
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| 62 | |
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| 63 | for (i = 0; i < MAX_SEGMENTS; i++) { |
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| 64 | if ( memlock_table[i].addr == NULL ) { |
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| 65 | memlock_table[i].level = level; |
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| 66 | memlock_table[i].addr = addr; |
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| 67 | memlock_table[i].len = len; |
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| 68 | return 0; |
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| 69 | } |
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| 70 | } |
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| 71 | |
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| 72 | return -1; |
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| 73 | } |
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| 74 | |
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[4244] | 75 | static inline int memlock_lock(struct memlock * seg) { |
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| 76 | return roar_mm_mlock(seg->addr, seg->len); |
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[4241] | 77 | } |
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| 78 | |
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[4244] | 79 | static inline int memlock_unlock(struct memlock * seg) { |
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| 80 | return roar_mm_munlock(seg->addr, seg->len); |
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[4241] | 81 | } |
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| 82 | |
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[4233] | 83 | int memlock_str2level(const char * str) { |
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| 84 | if ( str == NULL ) |
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| 85 | return -1; |
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| 86 | |
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| 87 | if ( !strcasecmp(str, "none") ) { |
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| 88 | return MEMLOCK_NONE; |
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| 89 | } else if ( !strcasecmp(str, "low") ) { |
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| 90 | return MEMLOCK_LOW; |
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| 91 | } else if ( !strcasecmp(str, "medium") ) { |
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| 92 | return MEMLOCK_MEDIUM; |
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[4251] | 93 | } else if ( !strcasecmp(str, "high") ) { |
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| 94 | return MEMLOCK_HIGH; |
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| 95 | } else if ( !strcasecmp(str, "nearlyall") ) { |
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| 96 | return MEMLOCK_NEARLYALL; |
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| 97 | } else if ( !strcasecmp(str, "nearlyallsys") ) { |
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| 98 | return MEMLOCK_NEARLYALLSYS; |
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| 99 | } else if ( !strcasecmp(str, "allcur") ) { |
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| 100 | return MEMLOCK_ALLCUR; |
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[4233] | 101 | } else if ( !strcasecmp(str, "all") ) { |
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| 102 | return MEMLOCK_ALL; |
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| 103 | } else if ( !strcasecmp(str, "default") ) { |
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| 104 | return MEMLOCK_DEFAULT; |
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| 105 | } else { |
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| 106 | return -1; |
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| 107 | } |
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| 108 | } |
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| 109 | |
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| 110 | int memlock_set_level(int level) { |
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| 111 | static int old_level = MEMLOCK_NONE; |
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[4241] | 112 | int i; |
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| 113 | int ret = 0; |
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[4233] | 114 | |
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[4247] | 115 | ROAR_DBG("memlock_set_level(level=%i) = ?", level); |
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| 116 | |
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| 117 | ROAR_DBG("memlock_set_level(level=%i): ask for locking level change: %i->%i", level, old_level, level); |
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| 118 | |
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[4234] | 119 | if ( !memlock_table_inited ) |
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| 120 | memlock_table_init(); |
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| 121 | |
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[4247] | 122 | if ( level == old_level ) { |
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| 123 | ROAR_DBG("memlock_set_level(level=%i) = 0 // old and new level are the same, nothing to do", level); |
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[4233] | 124 | return 0; |
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[4247] | 125 | } |
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[4233] | 126 | |
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[4250] | 127 | // TODO: fix those #ifdefs and replace them with more general tests |
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| 128 | if ( level == MEMLOCK_ALL ) { |
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| 129 | #ifdef ROAR_HAVE_MLOCKALL |
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| 130 | // if we do not have ROAR_HAVE_MLOCKALL we do not have MCL_* flags. |
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| 131 | // we just try to lock all known segments as fallback. |
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[4251] | 132 | old_level = MEMLOCK_ALL; |
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[4250] | 133 | return roar_mm_mlockall(MCL_CURRENT|MCL_FUTURE); |
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| 134 | #endif |
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[4251] | 135 | } else if ( level == MEMLOCK_ALLCUR ) { |
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| 136 | #ifdef ROAR_HAVE_MLOCKALL |
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| 137 | old_level = MEMLOCK_ALLCUR; |
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| 138 | return roar_mm_mlockall(MCL_CURRENT); |
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| 139 | #endif |
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| 140 | } else if ( old_level == MEMLOCK_ALL || old_level == MEMLOCK_ALLCUR ) { |
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[4250] | 141 | #ifdef ROAR_HAVE_MUNLOCKALL |
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| 142 | ret = roar_mm_munlockall(); |
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| 143 | // after roar_mm_munlockall() we need to re-lock all segemnts of target locking level. |
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| 144 | i = old_level; |
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| 145 | old_level = MEMLOCK_NONE; |
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| 146 | return memlock_set_level(i); |
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| 147 | #endif |
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| 148 | } |
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| 149 | |
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[4241] | 150 | for (i = 0; i < MAX_SEGMENTS; i++) { |
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[4247] | 151 | if ( memlock_table[i].addr != NULL ) { |
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| 152 | ROAR_DBG("memlock_set_level(level=%i): found registerd segment %i at %p with %llu Byte length", level, i, memlock_table[i].addr, (unsigned long long int)memlock_table[i].len); |
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[4241] | 153 | if ( level > old_level ) { |
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| 154 | if ( memlock_table[i].level > old_level && memlock_table[i].level <= level ) |
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| 155 | if ( memlock_lock(&(memlock_table[i])) == -1 ) |
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| 156 | ret = -1; |
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| 157 | } else { |
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| 158 | if ( memlock_table[i].level <= old_level && memlock_table[i].level > level ) |
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| 159 | if ( memlock_unlock(&(memlock_table[i])) == -1 ) |
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| 160 | ret = -1; |
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| 161 | } |
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| 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | old_level = level; |
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| 166 | |
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[4247] | 167 | ROAR_DBG("memlock_set_level(level=%i) = %i", level, ret); |
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[4241] | 168 | return ret; |
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[4233] | 169 | } |
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| 170 | |
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| 171 | void memlock_unload() { |
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| 172 | } |
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| 173 | |
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| 174 | void memlock_reload() { |
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| 175 | } |
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| 176 | |
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[4232] | 177 | //ll |
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