Make fiber_pool more conservative on platforms with limited address space.

We use COROUTINE_LIMITED_ADDRESS_SPACE to select platforms where address
space is 32-bits or less. Fiber pool implementation enables more book
keeping, and reduces upper limits, in order to minimise address space
utilisation.

5 files changed, 11 insertions, 0 deletions

diff --git a/coroutine/arm32/Context.h b/coroutine/arm32/Context.h
index 27f97908bc..e29fe1bb63 100644
--- a/coroutine/arm32/Context.h
+++ b/coroutine/arm32/Context.h
@@ -11,6 +11,7 @@
 #include <string.h>
 
 #define COROUTINE __attribute__((noreturn)) void
+#define COROUTINE_LIMITED_ADDRESS_SPACE
 
 enum {COROUTINE_REGISTERS = 8};
 
diff --git a/coroutine/copy/Context.h b/coroutine/copy/Context.h
index a62efa4e8a..0b6e3a9be0 100644
--- a/coroutine/copy/Context.h
+++ b/coroutine/copy/Context.h
@@ -16,6 +16,10 @@
 
 #define COROUTINE __attribute__((noreturn)) void
 
+#if INTPTR_MAX <= INT32_MAX
+#define COROUTINE_LIMITED_ADDRESS_SPACE
+#endif
+
 // This stack copying implementation which uses a private stack for each coroutine, including the main one.
 #define COROUTINE_PRIVATE_STACK
 
diff --git a/coroutine/ucontext/Context.h b/coroutine/ucontext/Context.h
index bde9be302a..6cf16c8604 100644
--- a/coroutine/ucontext/Context.h
+++ b/coroutine/ucontext/Context.h
@@ -13,6 +13,10 @@
 
 #define COROUTINE __attribute__((noreturn)) void
 
+#if INTPTR_MAX <= INT32_MAX
+#define COROUTINE_LIMITED_ADDRESS_SPACE
+#endif
+
 struct coroutine_context
 {
     ucontext_t state;
diff --git a/coroutine/win32/Context.h b/coroutine/win32/Context.h
index fe1a8a3648..c70b65cd2f 100644
--- a/coroutine/win32/Context.h
+++ b/coroutine/win32/Context.h
@@ -11,6 +11,7 @@
 #include <string.h>
 
 #define COROUTINE __declspec(noreturn) void __fastcall
+#define COROUTINE_LIMITED_ADDRESS_SPACE
 
 /* This doesn't include thread information block */
 enum {COROUTINE_REGISTERS = 4};
diff --git a/coroutine/x86/Context.h b/coroutine/x86/Context.h
index a783dd296f..6d3a56eaa6 100644
--- a/coroutine/x86/Context.h
+++ b/coroutine/x86/Context.h
@@ -11,6 +11,7 @@
 #include <string.h>
 
 #define COROUTINE __attribute__((noreturn, fastcall)) void
+#define COROUTINE_LIMITED_ADDRESS_SPACE
 
 enum {COROUTINE_REGISTERS = 4};