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DosQProcStatus API for IBM OS/2 Version 2.0
May 11, 1992
Warnings
This document includes a written description of the DosQProcStatus API for
IBM OS/2 Version 2.0.
INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS DOCUMENT "AS IS"
WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.
IN NO EVENT WILL IBM BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED
TO ANY LOST PROFITS, LOST SAVINGS OR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM BY YOU
BASED ON A THIRD PARTY CLAIM.
Some or all of the interfaces described in this document are unpublished.
IBM reserves the right to change or delete them in future versions of OS/2 at
IBM's sole discretion, without notice to you. IBM does not guarentee that
compatibility of your applications will be maintained with future versions of
OS/2.
This document could include technical inaccuracies or typographical
errors. It is possible that this document may contain reference to, or
information about, IBM products, programming or services that are not
announced in your country. Such references or information must not be
construed to mean that IBM intends to announce such IBM products, programming
or services in your country.
IBM may have patents or pending patent applications covering subject
matter in this document. The furnishing of this document does not give you
any license to these patents. You can send license inquiries, in writing, to
the IBM Director of Commercial Relations, IBM Corporation, Armonk NY 10504.
Copyright International Business Machines Corporation 1992. All rights
reserved.
Note to US Government Users - Documentation related to restricted rights -
Use, duplication or disclosure is subject to restrictions set forth in GSA
ADP Schedule Contract with IBM Corp.
_____________________________________________________________________________
DosQProcStatus API
___________________
Purpose
_______
The DosQProcStatus API is a 16 bit API that returns information that
summarizes the system resources that are inuse of an OS/2 2.0 system.
DosQProcStatus reports on the following classes of OS/2 2.0 system resources:
Processes and Threads
Dynamic Link Library Modules
16 bit System Semaphores
Named Shared Memory Segments
API Calling Sequence
____________________
The following 16 bit C language function prototype can be used to call the
DosQProcStatus API:
extern unsigned far pascal DosQProcStatus(ULONG far *buffer,
USHORT buffer_size)
Where: buffer - is a pointer to a buffer that will be filled
with system resource summary information
records
buffer_size - is the size of the buffer in bytes
(the maximum value of 64KB is typically
the safest sized buffer to use since it
is impossible to predict how much
information a DosQProcStatus call will
return)
Returns: 0 - indicates correct operation, buffer is now filled
with system resource summary information
records
non-zero - error returns
Pointers: The OS/2 Process Status Utility (PSTAT) uses a conversion
formula to convert the pointers that are returned by
DosQProcStatus.
#define CONVERT(fp) (*((unsigned far*) &(fp) + 1) = QSsel)
Where: fp - is a pointer that points to the head of a
record structure.
QSel - is the 16 bit selector for the segment
that contains the DosQProcStatus
buffer.
Linker Considerations
______________________
In order to successfully resolve DosQProcStatus function calls in your
program, the following lines must be added to the Linker Definition (DEF) file:
IMPORTS
DOSQPROCSTATUS=DOSCALL1.154
Overview
_________
DosQProcStatus returns a buffer that is filled with a series of sections
of resource information:
First, a section that contains an array of pointers to the other sections
in the buffer.
Second, a small global data section that contains system-wide
information. In OS/2 2.0 the only value of interest in this section is the
total number of threads in the system at the time the DosQProcStatus call was
made.
Third, a section consisting of Process and Thread records. There is one
Process record for each process in the system. Each Process record is
immediately followed by a set of Thread records (one Thread record for each
thread within the process). Process records contain arrays of resource
identifiers (16 bit semaphore indices, dynamic link library handles and
shared memory segment handles) that identify the resources that the process
currently has in use. The handles and indices can be used to indirectly
point to 16 bit semaphore records, dynamic link library records and shared
memory segment records that reside in the subsequent sections of the buffer.
Fourth, a section consisting of 16 Bit System Semaphore records. This
section is headed by a small record that contains some summary
information concerning 16 bit system semaphores. The summary record is
followed by a series of 16 Bit System Semaphore records. Each record
characterizes a separate 16 bit system semaphore. Among other information,
each record contains the name of the 16 bit system semaphore, how many
processes have opened it, and what thread (if any) currently owns it.
Fifth, a section consisting of Executable Module records. Program (.EXE)
files, dynamic link library (.DLL) modules and device driver (.SYS) modules
are all examples of executable modules. Each record characterizes a separate
executable module. Each record includes the full pathname of the module, the
module's handle and an array of handles of the DLL modules that are directly
referenced by the module. The full pathname of a process is obtained from
the Executable Module record of its program file module (which is pointed to
by the .EXE module handle value contained in its Process record).
Sixth, a section consisting of Shared Memory Segment records. Each
record includes the handle of the segment, the 16 bit selector associated
with the segment, the number of processes using the segment and the name of
the segment.
Pointer Record Section
_______________________
The following pointer record structure is the first section in the buffer.
It contains pointers to the heads of the system resource information
sections.
typedef struct qsPtrRec_s {
qsGrec_t *pGlobalRec; /* ptr to the global data section */
qsPrec_t *pProcRec; /* ptr to process record section */
qsS16Headrec_t *p16SemRec; /* ptr to 16 bit sem section */
qsMrec_t *pShrMemRec; /* ptr to shared mem section */
qsLrec_t *pLibRec; /*ptr to exe module record section*/
} qsPtrRec_t;
Global Data Section
___________________
The following C language structure defines the information contained
within the global data section that describes global system information.
typedef struct qsGrec_s {
ULONG cThrds; /* number of threads in use */
ULONG Reserved;
ULONG Reserved;
}qsGrec_t;
Process and Thread Data Section
_______________________________
The following C language declarations define the information contained
within the system resource summary information record that describes an OS/2
process. Each process record is immediately followed by one or more thread
records for the given process. The pointer qsTrec_t points to the first
thread record structure for the process.
typedef struct qsPrec_s {
ULONG RecType; /* type of record being processed */
/* process rectype = 1 */
qsTrec_t FAR *pThrdRec; /* ptr to 1st thread rec for this prc*/
USHORT pid; /* process ID */
USHORT ppid; /* parent process ID */
ULONG type; /* process type */
ULONG stat; /* process status */
ULONG sgid; /* process screen group */
USHORT hMte; /* program module handle for process */
USHORT cTCB; /* # of TCBs in use in process */
ULONG Reserved
void FAR Reserved
USHORT c16Sem; /*# of 16 bit system sems in use by proc*/
USHORT cLib; /* number of runtime linked libraries */
USHORT cShrMem; /* number of shared memory handles */
USHORT Reserved
USHORT FAR *p16SemRec; /*ptr to head of 16 bit sem inf for proc*/
USHORT FAR *pLibRec; /*ptr to list of runtime lib in use by */
/*process*/
USHORT FAR *pShrMemRec; /*ptr to list of shared mem handles in */
/*use by process*/
USHORT FAR Reserved
} qsPrec_t;
/* Process Record structure
* Holds all per process information.
* ________________________________
* | RecType (=0x00000001) |
* |-------------------------------|
* | pThrdRec |----|
* |-------------------------------| |
* | pid | |
* |-------------------------------| |
* | ppid | |
* |-------------------------------| |
* | type | |
* |-------------------------------| |
* | stat | |
* |-------------------------------| |
* | sgid | |
* |-------------------------------| |
* | hMte | |
* |-------------------------------| |
* | cTCB | |
* |-------------------------------| |
* | c16Sem | |
* |-------------------------------| |
* | cLib | |
* |-------------------------------| |
* | cShrMem | |
* |-------------------------------| |
* | p16SemRec |----|--------|
* |-------------------------------| | |
* | pLibRec |----|--------|------|
* |-------------------------------| | | |
* | pShrMemRec |----|--------|------|----|
* |-------------------------------| | | | |
* | 16SemIndx[0] |<---|--------| | |
* | . | | | |
* | . | | | |
* | . | | | |
* | 16SemIndx[c16Sem-1] | | | |
* |-------------------------------| | | |
* | hmte[0] (or "name str") |<---|---------------| |
* | . | | |
* | . | | |
* | . | | |
* | hmte[cLib-1] | | |
* |-------------------------------| | |
* | hshmem[0] |<---|--------------------|
* | . | |
* | . | |
* | . | |
* | hshmem[cShrMem-1] | |
* |-------------------------------| |
* * refer to thread rec structure<-----
*/
The pLibRec value points to an array of mte handles that indicate the
DLL modules that are directly referred to by the process (.EXE) program
file module. The cLib value indicates how many dynamic link library module
handles are in the array.
The pShrMemRec value points to an array of shared memory handles that
indicate the shared memory segments that are being used by the process. The
cShrMem value indicates how many shared memory segment handles are in the
array.
The p16SemRec value points to an array of 16 bit system semaphore indices
that indicate the 16 bit system semaphores that are being used by the
process. The c16Sem value indicates how many 16 bit system semaphore indices
are in the array.
The status flag gives an indication of the current status of a process.
The following list defines the possible values for the status flag:
0x01 - Doing ExitList Processing
0x02 - Exiting thread 1
0x04 - The whole process is exiting
0x10 - Parent cares about termination
0x20 - Parent did an exec-and-wait
0x40 - Process is dying
0x80 - Process in embryonic state
The following C language declarations define the information contained
within the system resource summary information record that describes an OS/2
thread:
/* Thread Record structure
* Holds all per thread information.
*/
typedef struct qsTrec_s {
ULONG RecType; /* Record Type */
/* Thread rectype = 100 */
USHORT tid; /* thread ID */
USHORT slot; /* "unique" thread slot number */
ULONG sleepid; /* sleep id thread is sleeping on */
ULONG priority; /* thread priority */
ULONG systime; /* thread system time */
ULONG usertime; /* thread user time */
UCHAR state; /* thread state */
PADCHAR
PADSHORT
} qsTrec_t;
// Thread Record Structure
// ________________________________
// | RecType (=0x00000100) |----|
// |-------------------------------| |
// | tid | |
// |-------------------------------| |
// | slot | |
// |-------------------------------| |
// | sleepid | |
// |-------------------------------| |
// | priority | |
// |-------------------------------| |
// | systime | |
// |-------------------------------| |
// | usertime | |
// |-------------------------------| |
// | state | |
// |-------------------------------| |
// <--------|
The thread slot number is an internal OS/2 thread identifier. OS/2
must uniquely identify all threads within the system.
The state value gives an indication of the current state of a thread.
The following list defines some typical thread state values:
1 - Ready to run
2 - Blocked
5 - Running
It is outside the scope of this document to further describe and explain
the various thread state values.
16 Bit System Semaphore Section
________________________________
The following C language declarations define the information contained
within the system resource summary information record that is the first
record in the 16 bit system semaphore record section of the DosQProcStatus
buffer:
typedef struct qsS16Headrec_s {
ULONG SRecType; /* semaphore rectype = 3 */
ULONG Reserved; /* overlays NextRec of 1st qsS16rec_t*/
ULONG Reserved;
ULONG S16TblOff; /* index of first semaphore,SEE PSTAT OUTPUT*/
/* System Semaphore Information Section */
} qsS16Headrec_t;
// 16 bit System Semaphore Header Record Structure
// ________________________________
// | qsS16Headrec |
// |-------------------------------|
// | qsS16rec_s |____
// |_______________________________| |
// | |<---|
// | qsS16rec_s |----
// |______________________________ | |
// | |<--|
// | qsS16rec_s |____
// |_______________________________| |
// | . |<--|
// |-------------------------------|
//
//
The following C language declarations define the 16 bit system semaphore
records:
typedef struct qsS16rec_s {
ULONG NextRec; /* offset to next record in buffer*/
UINT s_SysSemOwner ; /* thread owning this semaphore */
UCHAR s_SysSemFlag ; /* system semaphore flag bit field*/
UCHAR s_SysSemRefCnt ; /* number of references to this */
/* system semaphore */
UCHAR s_SysSemProcCnt ; /*number of requests by sem owner*/
UCHAR Reserved;
ULONG Reserved;
UINT Reserved;
CHAR SemName; /* start of semaphore name string */
} qsS16rec_t;
// 16 bit System Semaphore Record Structure
// ________________________________
// | pNextRec |----|
// |-------------------------------| |
// | | |
// | SysSemOwner | |
// | SysSemFlag | |
// | SysSemRecCnt | |
// | SysSemProcCnt | |
// | | |
// |-------------------------------| |
// |SemName: | |
// | "pathname" | |
// |-------------------------------| |
// <-----
//
The s_SysSemOwner is the slot ID of the semaphore's owner
The s_SysSemFlag is the system semaphore flag bit field which describes
the type or action the semaphore is performing.
The s_SysSemRecCnt is the number of references to a specific semaphore.
The SemName value is actually the first byte of an ASCIIZ string that is
the complete pathname of the 16 bit system semaphore.
Executable Module Section
___________________________
The following C language declarations define the information contained
within the system resource summary information record that describes an OS/2
DLL module:
typedef struct qsLrec_s {
void FAR *pNextRec; /* pointer to next record in buffer */
USHORT hmte; /* handle for this mte */
USHORT Reserved; /* Reserved */
ULONG ctImpMod; /* # of imported modules in table */
ULONG Reserved /* Reserved */
*** qsLObjrec_t FAR *Reserved; /* Reserved */
UCHAR FAR *pName; /* ptr to name string following stru*/
} qsLrec_t;
/*
* System wide MTE information
* ________________________________
* | pNextRec |----|
* |-------------------------------| |
* | hmte | |
* |-------------------------------| |
* | ctImpMod | |
* |-------------------------------| |
* | Reserved | |
* |-------------------------------| |
* | Reserved | |
* |-------------------------------| |
* | pName |----|----|
* |-------------------------------| | |
* | imported module handles | | |
* | . | | |
* | . | | |
* | . | | |
* |-------------------------------| <--|----|
* | "pathname" | |
* |_______________________________| |
* <-----
*/
The hmte value is a unique identifier that identifies this DLL
module.
The ctImpMod value indicates how many other DLL's this module statically
references. The ctImpMod value does not take into account any DLL's that
were dynamically linked at run time.
The pName value is a 16 bit pointer that points to an ASCIIZ string that
follows the DLL module record. The string contains the pathname of the DLL
module.
Shared Memory Segment Section
______________________________
The following C language declarations define the information contained
within the system resource summary information record that describes an OS/2
shared memory segment:
typedef struct qsMrec_s {
ULONG MemNextRec; /* offset to next record in buffer */
USHORT hmem; /* handle for shared memory */
USHORT sel; /* shared memory selector */
USHORT refcnt; /* reference count */
CHAR Memname; /* start of shared memory name string */
} qsMrec_t;
// Shared Mem Record Structure
// ________________________________
// | MemNextRec |----|
// |-------------------------------| |
// | hmem | |
// |-------------------------------| |
// | sel | |
// |-------------------------------| |
// | refcnt | |
// |-------------------------------| |
// | Memname | |
// |_______________________________| |
// <-----
Like the 16 bit system semaphore record, the shared memory segment record
contains its full ASCIIZ string pathname at the end of the record.