openbsd: introduce _MAX_PAGE_SHIFT to compute PTHREAD_STACK_MIN, MINSIGSTKSZ, and SIGSTKSZ

Author: semarie

src/unix/bsd/netbsdlike/openbsd/aarch64.rs

@@ -12,3 +12,5 @@ cfg_if! {
         pub const _ALIGNBYTES: usize = 8 - 1;
     }
 }
+
+pub const _MAX_PAGE_SHIFT: u32 = 12;

src/unix/bsd/netbsdlike/openbsd/mod.rs

@@ -1297,8 +1297,9 @@ pub const IFF_LINK1: ::c_int = 0x2000; // per link layer defined bit
 pub const IFF_LINK2: ::c_int = 0x4000; // per link layer defined bit
 pub const IFF_MULTICAST: ::c_int = 0x8000; // supports multicast
 
-pub const PTHREAD_STACK_MIN : ::size_t = 4096;
-pub const SIGSTKSZ : ::size_t = 28672;
+pub const PTHREAD_STACK_MIN: ::size_t = (1_usize << _MAX_PAGE_SHIFT);
+pub const MINSIGSTKSZ: ::size_t = (3_usize << _MAX_PAGE_SHIFT);
+pub const SIGSTKSZ: ::size_t = MINSIGSTKSZ + (1_usize << _MAX_PAGE_SHIFT) * 4;
 
 pub const PT_FIRSTMACH: ::c_int = 32;
 

src/unix/bsd/netbsdlike/openbsd/x86.rs

@@ -12,3 +12,5 @@ cfg_if! {
         pub const _ALIGNBYTES: usize = 4 - 1;
     }
 }
+
+pub const _MAX_PAGE_SHIFT: u32 = 12;

src/unix/bsd/netbsdlike/openbsd/x86_64.rs

@@ -15,6 +15,8 @@ cfg_if! {
     }
 }
 
+pub const _MAX_PAGE_SHIFT: u32 = 12;
+
 pub const PT_STEP: ::c_int = PT_FIRSTMACH + 0;
 pub const PT_GETREGS: ::c_int = PT_FIRSTMACH + 1;
 pub const PT_SETREGS: ::c_int = PT_FIRSTMACH + 2;