add explicit gcsafe annotations (fixes #174) (#175)

Seems like a variation of https://github.com/nim-lang/Nim/issues/17369

chronos.nimble

@@ -1,5 +1,5 @@
 packageName   = "chronos"
-version       = "3.0.0"
+version       = "3.0.1"
 author        = "Status Research & Development GmbH"
 description   = "Chronos"
 license       = "Apache License 2.0 or MIT"

chronos/asyncfutures2.nim

@@ -621,7 +621,7 @@ proc `or`*[T, Y](fut1: Future[T], fut2: Future[Y]): Future[void] =
   ## If cancelled, ``fut1`` and ``fut2`` futures WILL NOT BE cancelled.
   var retFuture = newFuture[void]("chronos.or")
   var cb: proc(udata: pointer) {.gcsafe, raises: [Defect].}
-  cb = proc(udata: pointer) =
+  cb = proc(udata: pointer) {.gcsafe, raises: [Defect].} =
     if not(retFuture.finished()):
       var fut = cast[FutureBase](udata)
       if cast[pointer](fut1) == udata:
@@ -912,7 +912,7 @@ proc one*[T](futs: varargs[Future[T]]): Future[Future[T]] =
   var nfuts = @futs
 
   var cb: proc(udata: pointer) {.gcsafe, raises: [Defect].}
-  cb = proc(udata: pointer) =
+  cb = proc(udata: pointer) {.gcsafe, raises: [Defect].} =
     if not(retFuture.finished()):
       var res: Future[T]
       var rfut = cast[FutureBase](udata)
@@ -959,7 +959,7 @@ proc race*(futs: varargs[FutureBase]): Future[FutureBase] =
   var nfuts = @futs
 
   var cb: proc(udata: pointer) {.gcsafe, raises: [Defect].}
-  cb = proc(udata: pointer) =
+  cb = proc(udata: pointer) {.gcsafe, raises: [Defect].} =
     if not(retFuture.finished()):
       var res: FutureBase
       var rfut = cast[FutureBase](udata)

chronos/asyncloop.nim

@@ -900,7 +900,7 @@ proc stepsAsync*(number: int): Future[void] =
   var counter = 0
 
   var continuation: proc(data: pointer) {.gcsafe, raises: [Defect].}
-  continuation = proc(data: pointer) =
+  continuation = proc(data: pointer) {.gcsafe, raises: [Defect].} =
     if not(retFuture.finished()):
       inc(counter)
       if counter < number:
@@ -1033,7 +1033,7 @@ proc wait*[T](fut: Future[T], timeout = InfiniteDuration): Future[T] =
         retFuture.fail(newException(AsyncTimeoutError, "Timeout exceeded!"))
 
   var cancellation: proc(udata: pointer) {.gcsafe, raises: [Defect].}
-  cancellation = proc(udata: pointer) =
+  cancellation = proc(udata: pointer) {.gcsafe, raises: [Defect].} =
     if not isNil(timer):
       clearTimer(timer)
     if not(fut.finished()):

chronos/asyncmacro2.nim

@@ -27,7 +27,7 @@ when defined(chronosStrictException):
     var nameIterVar = iteratorNameSym
     {.push stackTrace: off.}
     var identName: proc(udata: pointer) {.gcsafe, raises: [Defect].}
-    identName = proc(udata: pointer) {.raises: [Defect].} =
+    identName = proc(udata: pointer) {.gcsafe, raises: [Defect].} =
       try:
         # If the compiler complains about unlisted exception here, it's usually
         # because you're calling a callback or forward declaration in your code
@@ -64,7 +64,7 @@ else:
     var nameIterVar = iteratorNameSym
     {.push stackTrace: off.}
     var identName: proc(udata: pointer) {.gcsafe, raises: [Defect].}
-    identName = proc(udata: pointer) {.raises: [Defect].} =
+    identName = proc(udata: pointer) {.gcsafe, raises: [Defect].} =
       try:
         # If the compiler complains about unlisted exception here, it's usually
         # because you're calling a callback or forward declaration in your code

chronos/transports/stream.nim

@@ -767,7 +767,7 @@ when defined(windows):
       ## Unix domain socket emulation with Windows Named Pipes.
       var pipeHandle = INVALID_HANDLE_VALUE
       var pipeContinuation: proc (udata: pointer) {.gcsafe, raises: [Defect].}
-      pipeContinuation = proc (udata: pointer) =
+      pipeContinuation = proc (udata: pointer) {.gcsafe, raises: [Defect].} =
         # Continue only if `retFuture` is not cancelled.
         if not(retFuture.finished()):
           var pipeSuffix = $cast[cstring](unsafeAddr address.address_un[0])