CRITICAL_SECTION

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Picnic

Joined: 05 May 2007
Posts: 1404
Location: Piraeus, Greece

Picnic 16 Jul 2009, 07:57

Good day all,

I want to use critical section functions and i need to declare a variable of type CRITICAL_SECTION
Where can i found this structure?
I've searched board for an example, but with no luck so far.

16 Jul 2009, 07:57

Picnic

Joined: 05 May 2007
Posts: 1404
Location: Piraeus, Greece

Picnic 16 Jul 2009, 11:53

Ok, I think i found it.

Code:

struc RTL_CRITICAL_SECTION {
  .DebugInfo dd ?
     .LockCount dd ?
     .RecursionCount dd ?
        .OwningThread dd ?
  .LockSemaphore dd ?
 .SpinCount dd ?
       }

16 Jul 2009, 11:53

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 16 Jul 2009, 15:59

To be safe better use this:

Code:

struc RTL_CRITICAL_SECTION {
align 4 ; Will pad with NOPs only if more initialized data and/or instructions follows in the current section, otherwise it will only reserve space
.:
        .DebugInfo dd ?
        .LockCount dd ?
        .RecursionCount dd ?
        .OwningThread dd ?
        .LockSemaphore dd ?
        .SpinCount dd ?
       }

I don't remember if EnterCriticalSection and/or InitializeCriticalSection fail if the structure is unaligned but yet I think there could be some problems on multi-{core|CPU} systems.

16 Jul 2009, 15:59

Picnic

Joined: 05 May 2007
Posts: 1404
Location: Piraeus, Greece

Picnic 17 Jul 2009, 15:31

Thank you LocoDelAssembly.

17 Jul 2009, 15:31

Picnic

Joined: 05 May 2007
Posts: 1404
Location: Piraeus, Greece

Picnic 21 Jul 2009, 11:12

Hi again guys,
I need to use the in_addr structure in fasm.

Code:

typedef struct in_addr {
  union {
    struct {
      u_char s_b1,s_b2,s_b3,s_b4;
    } S_un_b;
    struct {
      u_short s_w1,s_w2;
    } S_un_w;
    u_long S_addr;
  } S_un;
}IN_ADDR, *PIN_ADDR, FAR *LPIN_ADDR;

I found MASM in_addr structure code below..

Code:

S_UN_B STRUCT
  s_b1 BYTE ?
  s_b2 BYTE ?
  s_b3 BYTE ?
  s_b4 BYTE ?
ENDS
 
S_UN_W STRUCT 
  s_w1 WORD ?
  s_w2 WORD ?
ENDS
 
ADDRESS_UNION UNION 
   S_un_b S_UN_B <>
   S_un_w S_UN_W <>
   S_addr DWORD ?
ENDS
 
in_addr STRUCT
  S_un ADDRESS_UNION <>
in_addr ENDS

..and attempt a rewrite in fasm.
Is this correct ?

Code:

struc S_un_b {
        .s_b1 db ?
          .s_b2 db ?
          .s_b3 db ?
          .s_b4 db ?
          }

struc S_un_w {
   .s_w1 dw ?
          .s_w2 dw ?
          }

struc ADDRESS_UNION {
   virtual
      .S_un_b S_un_b
      .S_un_w S_un_w
              .S_addr dd ?
   end virtual
      }

struc in_addr  {
         .S_un ADDRESS_UNION
         }

   virtual at 0
       in_addr in_addr
     sizeof.in_addr:
   end virtual

21 Jul 2009, 11:12

bitRAKE

Joined: 21 Jul 2003
Posts: 4075
Location: vpcmpistri

bitRAKE 21 Jul 2009, 14:23

ADDRESS_UNION doesn't seem correct, but the rest is okay.

Code:

struc ADDRESS_UNION {
   virtual at $
        .S_un_b S_un_b
   end virtual
   virtual at $
        .S_un_w S_un_w
   end virtual
   .S_addr dd ?
        }

...no testing done - maybe, there is a better way?

21 Jul 2009, 14:23

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