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Fixed RingBufferControl::resize moving heads that are at the write head, and leaving heads outside the buffer when shrinking past the end of buffer. (#436)

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This commit is contained in:
Branimir Karadžić
2026-09-30 22:27:35 -07:00
committed by GitHub
parent 3b8366af83
commit 1c986bd1e9
3 changed files with 139 additions and 6 deletions
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117
tests/ringbuffer_test.cpp
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@@ -123,3 +123,120 @@ TEST_CASE("RingBufferControl resize", "")
REQUIRE(control.m_write == 0);
REQUIRE(control.m_read == 1);
}
TEST_CASE("RingBufferControl resize without reserved slots", "")
{
{
bx::RingBufferControl control(8);
REQUIRE(5 == control.reserve(5) );
REQUIRE(5 == control.commit(5) );
REQUIRE(2 == control.consume(2) );
control.resize(8);
REQUIRE(16 == control.getSize() );
REQUIRE(3 == control.getNumUsed() );
REQUIRE(0 == control.getNumReserved() );
REQUIRE(12 == control.getNumEmpty() );
REQUIRE(control.m_current == 5);
REQUIRE(control.m_write == 5);
REQUIRE(control.m_read == 2);
}
{
bx::RingBufferControl control(8);
REQUIRE(6 == control.reserve(6) );
REQUIRE(6 == control.commit(6) );
REQUIRE(5 == control.consume(5) );
REQUIRE(4 == control.reserve(4) );
REQUIRE(4 == control.commit(4) );
REQUIRE(control.m_current == 2);
REQUIRE(control.m_write == 2);
REQUIRE(control.m_read == 5);
control.resize(8);
REQUIRE(16 == control.getSize() );
REQUIRE(5 == control.getNumUsed() );
REQUIRE(0 == control.getNumReserved() );
REQUIRE(10 == control.getNumEmpty() );
REQUIRE(control.m_current == 2);
REQUIRE(control.m_write == 2);
REQUIRE(control.m_read == 13);
control.resize(-8);
REQUIRE(8 == control.getSize() );
REQUIRE(5 == control.getNumUsed() );
REQUIRE(0 == control.getNumReserved() );
REQUIRE(2 == control.getNumEmpty() );
REQUIRE(control.m_current == 2);
REQUIRE(control.m_write == 2);
REQUIRE(control.m_read == 5);
}
{
bx::RingBufferControl control(8);
REQUIRE(3 == control.reserve(3) );
REQUIRE(3 == control.commit(3) );
REQUIRE(3 == control.consume(3) );
control.resize(8);
REQUIRE(16 == control.getSize() );
REQUIRE(0 == control.getNumUsed() );
REQUIRE(0 == control.getNumReserved() );
REQUIRE(15 == control.getNumEmpty() );
REQUIRE(control.isEmpty() );
REQUIRE(control.m_current == 3);
REQUIRE(control.m_write == 3);
REQUIRE(control.m_read == 3);
}
}
TEST_CASE("RingBufferControl shrink past the end of buffer", "")
{
{
bx::RingBufferControl control(16);
REQUIRE(10 == control.reserve(10) );
REQUIRE(10 == control.commit(10) );
REQUIRE(8 == control.consume(8) );
REQUIRE(13 == control.getNumEmpty() );
control.resize(-13);
REQUIRE(3 == control.getSize() );
REQUIRE(2 == control.getNumUsed() );
REQUIRE(0 == control.getNumReserved() );
REQUIRE(0 == control.getNumEmpty() );
REQUIRE(control.m_current == 0);
REQUIRE(control.m_write == 0);
REQUIRE(control.m_read == 1);
}
{
bx::RingBufferControl control(32);
REQUIRE(29 == control.reserve(29) );
REQUIRE(29 == control.commit(29) );
REQUIRE(18 == control.consume(18) );
REQUIRE(20 == control.getNumEmpty() );
control.resize(-4);
REQUIRE(28 == control.getSize() );
REQUIRE(11 == control.getNumUsed() );
REQUIRE(0 == control.getNumReserved() );
REQUIRE(16 == control.getNumEmpty() );
REQUIRE(control.m_current == 0);
REQUIRE(control.m_write == 0);
REQUIRE(control.m_read == 17);
}
}