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Use AtomicStore() when setting the mem0.nearlyFull boolean to avoid

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harmless TSAN warnings and to forestall doubts about threadsafety.

FossilOrigin-Name: ce980af65a9b528f112baa22a95020a98ac5340155a0b53b09c46f99aad9b12b
This commit is contained in:
drh
2020-04-28 14:01:31 +00:00
parent 9f603fcefd
commit 23bef340be
3 changed files with 10 additions and 10 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Use\san\sAtomicLoad()\smacro\sin\ssqlite3HeapNearlyFull().
D 2020-04-28T11:45:41.489
C Use\sAtomicStore()\swhen\ssetting\sthe\smem0.nearlyFull\sboolean\sto\savoid\nharmless\sTSAN\swarnings\sand\sto\sforestall\sdoubts\sabout\sthreadsafety.
D 2020-04-28T14:01:31.572
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -497,7 +497,7 @@ F src/insert.c 8e4211d04eb460c0694d486c6ba1c068d468c6f653c3f237869a802ad82854de
F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
F src/loadext.c 421310045bd78afefb772294a99e50f37d87ae578786a6169074e6291e30d969
F src/main.c 652a782cd7b6c6ddf7419fcaf06b8aa9440b7c815857241171c9bdf03ab6544c
F src/malloc.c 998984783063d4172bb11630ba586e6c6483ddfc8e24a9881a6f495128f23569
F src/malloc.c a3e13b001f988ecec6bdb90c0ea8912c8c786e623724d7098da623d8d01d19b1
F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
F src/mem1.c c12a42539b1ba105e3707d0e628ad70e611040d8f5e38cf942cee30c867083de
F src/mem2.c f1940d9e91948dd6a908fbb9ce3835c36b5d83c3
@@ -1861,7 +1861,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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R 64df80a09bb93b99ef6e199142ecf936
U drh
Z 59f2a3e0f3e029b2d7560f165c376f3c
Z 42d1735aadc2a550c1baa98e0c20e909

2
manifest.uuid
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@@ -1 +1 @@
7556bc632e271d8a1e4fd836ce91e28213768ac09c90857b91171e9cd1009884
ce980af65a9b528f112baa22a95020a98ac5340155a0b53b09c46f99aad9b12b

6
src/malloc.c
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@@ -111,7 +111,7 @@ sqlite3_int64 sqlite3_soft_heap_limit64(sqlite3_int64 n){
}
mem0.alarmThreshold = n;
nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
mem0.nearlyFull = (n>0 && n<=nUsed);
AtomicStore(&mem0.nearlyFull, n>0 && n<=nUsed);
sqlite3_mutex_leave(mem0.mutex);
excess = sqlite3_memory_used() - n;
if( excess>0 ) sqlite3_release_memory((int)(excess & 0x7fffffff));
@@ -243,7 +243,7 @@ static void mallocWithAlarm(int n, void **pp){
if( mem0.alarmThreshold>0 ){
sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
if( nUsed >= mem0.alarmThreshold - nFull ){
mem0.nearlyFull = 1;
AtomicStore(&mem0.nearlyFull, 1);
sqlite3MallocAlarm(nFull);
if( mem0.hardLimit ){
nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
@@ -253,7 +253,7 @@ static void mallocWithAlarm(int n, void **pp){
}
}
}else{
mem0.nearlyFull = 0;
AtomicStore(&mem0.nearlyFull, 0);
}
}
p = sqlite3GlobalConfig.m.xMalloc(nFull);