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Add z/OS support for block allocator#19977

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Add z/OS support to block allocator
Signed-off-by: Dmitry Nikolaev <dnikolaev@rocketsoftware.com>
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@DNikolaevAtRocket
DNikolaevAtRocket committedNov 28, 2025
commit761005965b97a7b4d8b174636ce9465b5615baff
14 changes: 14 additions & 0 deletionssrc/storage/block_allocator.cpp
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Expand Up@@ -11,6 +11,9 @@
#else
#include <sys/mman.h>
#endif
#ifdef __MVS__
#include <zos-tls.h>
#endif

namespace duckdb {

Expand DownExpand Up@@ -67,6 +70,9 @@ static void OnDeallocation(const data_ptr_t pointer, const idx_t size) {
success = VirtualFree(pointer, size, MEM_DECOMMIT);
#elif defined(__APPLE__)
success = madvise(pointer, size, MADV_FREE_REUSABLE) == 0;
#elif defined(__MVS__)
// the madvice functionality is not available on z/OS in any form
success = true;
#else
success = madvise(pointer, size, MADV_DONTNEED) == 0;
#endif
Expand DownExpand Up@@ -187,9 +193,17 @@ class BlockAllocatorThreadLocalState {
};

BlockAllocatorThreadLocalState &GetBlockAllocatorThreadLocalState(const BlockAllocator &block_allocator) {
#ifdef __MVS__
auto allocator_state = BlockAllocatorThreadLocalState(block_allocator);
static __tlssim<BlockAllocatorThreadLocalState> local_state_impl(allocator_state);
auto *local_state = local_state_impl.access();
(*local_state).TryInitialize(block_allocator);
return *local_state;
#else
thread_local BlockAllocatorThreadLocalState local_state(block_allocator);
local_state.TryInitialize(block_allocator);
return local_state;
#endif
}

//===--------------------------------------------------------------------===//
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4 changes: 0 additions & 4 deletionstest/persistence/test_locking.cpp
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Expand Up@@ -7,10 +7,6 @@
#include <sys/mman.h>
#include <unistd.h>

#ifdef __MVS__
#define MAP_ANONYMOUS 0x0
#endif

using namespace duckdb;
using namespace std;

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4 changes: 0 additions & 4 deletionstest/persistence/test_persistence.cpp
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Expand Up@@ -7,10 +7,6 @@
#include<sys/mman.h>
#include<unistd.h>

#ifdef __MVS__
#defineMAP_ANONYMOUS0x0
#endif

usingnamespaceduckdb;
usingnamespacestd;

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