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https://github.com/transmission/transmission
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(trunk libT) add a unique key to each tr_bandwidth object, so that when sorting them arbitrarily we can use that key rather than their pointer address. Apparently comparing pointers that aren't allocated in the same array is undefined behavior.
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parent
f134858453
commit
2362580e0e
2 changed files with 14 additions and 10 deletions
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@ -82,13 +82,12 @@ bytesUsed( const uint64_t now, struct bratecontrol * r, size_t size )
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*******
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******/
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static inline int
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comparePointers( const void * a, const void * b )
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static int
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compareBandwidth( const void * va, const void * vb )
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{
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if( a != b )
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return a < b ? -1 : 1;
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return 0;
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const tr_bandwidth * a = va;
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const tr_bandwidth * b = vb;
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return a->uniqueKey - b->uniqueKey;
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}
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/***
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@ -98,9 +97,12 @@ comparePointers( const void * a, const void * b )
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void
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tr_bandwidthConstruct( tr_bandwidth * b, tr_session * session, tr_bandwidth * parent )
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{
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static unsigned int uniqueKey = 0;
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b->session = session;
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b->children = TR_PTR_ARRAY_INIT;
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b->magicNumber = BANDWIDTH_MAGIC_NUMBER;
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b->uniqueKey = uniqueKey++;
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b->band[TR_UP].honorParentLimits = true;
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b->band[TR_DOWN].honorParentLimits = true;
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tr_bandwidthSetParent( b, parent );
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@ -134,9 +136,9 @@ tr_bandwidthSetParent( tr_bandwidth * b,
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assert( tr_isBandwidth( b->parent ) );
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removed = tr_ptrArrayRemoveSorted( &b->parent->children, b, comparePointers );
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removed = tr_ptrArrayRemoveSorted( &b->parent->children, b, compareBandwidth );
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assert( removed == b );
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assert( tr_ptrArrayFindSorted( &b->parent->children, b, comparePointers ) == NULL );
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assert( tr_ptrArrayFindSorted( &b->parent->children, b, compareBandwidth ) == NULL );
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b->parent = NULL;
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}
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@ -146,8 +148,9 @@ tr_bandwidthSetParent( tr_bandwidth * b,
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assert( tr_isBandwidth( parent ) );
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assert( parent->parent != b );
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tr_ptrArrayInsertSorted( &parent->children, b, comparePointers );
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assert( tr_ptrArrayFindSorted( &parent->children, b, comparePointers ) == b );
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assert( tr_ptrArrayFindSorted( &parent->children, b, compareBandwidth ) == NULL );
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tr_ptrArrayInsertSorted( &parent->children, b, compareBandwidth );
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assert( tr_ptrArrayFindSorted( &parent->children, b, compareBandwidth ) == b );
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b->parent = parent;
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}
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}
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@ -111,6 +111,7 @@ typedef struct tr_bandwidth
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struct tr_bandwidth * parent;
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tr_priority_t priority;
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int magicNumber;
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unsigned int uniqueKey;
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tr_session * session;
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tr_ptrArray children; /* struct tr_bandwidth */
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struct tr_peerIo * peer;
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