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Add prepareClone and atClone APIs for Verilated models (#3503) (#4444)

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This API is used if the user copies the process using `fork`
and similar OS-level mechanisms. The `at_clone` member function
ensures that all model-allocated resources are re-allocated, such
that the copied child process/model can simulate correctly.

A typical allocated resource is the thread pool, which every model
has its own pool.
This commit is contained in:
Yinan Xu
2023-08-30 07:02:55 -04:00
committed by GitHub
parent ca6ab584d0
commit b4b74d72f0
10 changed files with 232 additions and 1 deletions
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include/verilated.cpp
+8
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@@ -2608,6 +2608,14 @@ VerilatedVirtualBase* VerilatedContext::threadPoolp() {
return m_threadPool.get();
}
void VerilatedContext::prepareClone() { delete m_threadPool.release(); }
VerilatedVirtualBase* VerilatedContext::threadPoolpOnClone() {
if (VL_UNLIKELY(m_threadPool)) m_threadPool.release();
m_threadPool = std::make_unique<VlThreadPool>(this, m_threads - 1);
return m_threadPool.get();
}
VerilatedVirtualBase*
VerilatedContext::enableExecutionProfiler(VerilatedVirtualBase* (*construct)(VerilatedContext&)) {
if (!m_executionProfiler) m_executionProfiler.reset(construct(*this));