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Remove system.setupForeignThreadGc if threads option is off or TLS

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emulation is enabled
This commit is contained in:
Anatoly Galiulin 2016-01-28 12:29:53 +06:00
commit 4f8244c717
1 changed files with 22 additions and 12 deletions
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34
lib/system/gc_common.nim
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@ -78,19 +78,29 @@ iterator items(stack: ptr GcStack): ptr GcStack =
yield s yield s
s = s.next s = s.next
var # There will be problems with GC in foreign threads if `threads` option is off or TLS emulation is enabled
localGcInitialized {.rtlThreadVar.}: bool const allowForeignThreadGc = compileOption("threads") and not compileOption("tlsEmulation")
proc setupForeignThreadGc*() = when allowForeignThreadGc:
## call this if you registered a callback that will be run from a thread not var
## under your control. This has a cheap thread-local guard, so the GC for localGcInitialized {.rtlThreadVar.}: bool
## this thread will only be initialized once per thread, no matter how often
## it is called. proc setupForeignThreadGc*() =
if not localGcInitialized: ## Call this if you registered a callback that will be run from a thread not
localGcInitialized = true ## under your control. This has a cheap thread-local guard, so the GC for
var stackTop {.volatile.}: pointer ## this thread will only be initialized once per thread, no matter how often
setStackBottom(addr(stackTop)) ## it is called.
initGC() ##
## This function is availble only when ``--threads:on`` and ``--tlsEmulation:off``
## switches are used
if not localGcInitialized:
localGcInitialized = true
var stackTop {.volatile.}: pointer
setStackBottom(addr(stackTop))
initGC()
else:
template setupForeignThreadGc*(): stmt =
{.error: "setupForeignThreadGc is availble only when ``--threads:on`` and ``--tlsEmulation:off`` are used".}
# ----------------- stack management -------------------------------------- # ----------------- stack management --------------------------------------
# inspired from Smart Eiffel # inspired from Smart Eiffel