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| author | Russ Cox <rsc@golang.org> | 2015-06-07 21:45:39 -0400 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2015-06-17 14:23:00 +0000 |
| commit | 08e25fc1ba397e02ec776561ed73b7f9a8b94392 (patch) | |
| tree | 5cfcfdf406d173039a1894ee61c6e99044389bff /src/runtime | |
| parent | e3dc59f33d87f93a28a913ec56db25de3a654f0c (diff) | |
| download | go-08e25fc1ba397e02ec776561ed73b7f9a8b94392.tar.xz | |
cmd/compile: introduce //go:systemstack annotation
//go:systemstack means that the function must run on the system stack.
Add one use in runtime as a demonstration.
Fixes #9174.
Change-Id: I8d4a509cb313541426157da703f1c022e964ace4
Reviewed-on: https://go-review.googlesource.com/10840
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/malloc.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go index 7fd54983ec..25371ab776 100644 --- a/src/runtime/malloc.go +++ b/src/runtime/malloc.go @@ -797,6 +797,17 @@ var globalAlloc struct { // Intended for things like function/type/debug-related persistent data. // If align is 0, uses default align (currently 8). func persistentalloc(size, align uintptr, sysStat *uint64) unsafe.Pointer { + var p unsafe.Pointer + systemstack(func() { + p = persistentalloc1(size, align, sysStat) + }) + return p +} + +// Must run on system stack because stack growth can (re)invoke it. +// See issue 9174. +//go:systemstack +func persistentalloc1(size, align uintptr, sysStat *uint64) unsafe.Pointer { const ( chunk = 256 << 10 maxBlock = 64 << 10 // VM reservation granularity is 64K on windows |