#LOAD Status Codes

By default, the #LOAD request is unconditional. Error conditions that can occur are:

A no-storage-in-program-pool condition is caused when there is not enough storage in the program pool to accommodate the program. This conditions results in a delay until sufficient storage becomes available (unless such a wait would cause a deadlock).
A nonconcurrent-program-in-use condition is caused when a copy of the program is already in use and is marked as nonconcurrent (indicating that this program can be used by a maximum of one task at a time). This conditions results in a delay until the program becomes available.
A storage-conflict condition occurs when a previously loaded copy of the program is temporarily overlayed while in use by a waiting task. This condition results in a delay until the program is replaced in the program pool.
Any abnormal condition will result in an abend. Conditions in this category include the following:
- I/O error
- Program not found in PDT, or marked as out-of-service
- Waiting for storage-pool or program-pool memory, the default action resulting from the no-storage-in-program-pool condition, would cause a deadlock

The issuing program can request return of control with the COND parameter to

avoid a delay or an abend.

After completion of the #LOAD function, the value in register 15 indicates the outcome of the operation:

Register 15 Value	Meaning
X'00'	The request has been serviced successfully.
X'04'	The request cannot be serviced due to insufficient storage in the program pool.
X'08'	The request cannot be serviced due to an I/O error during a load from a load library.
X'0C'	The requested program is nonconcurrent and in use.
X'10'	The requested program has been overlayed temporarily in the program pool, resulting in a storage conflict.
X'14'	The requested program is not defined to the PDT, is marked as out-of-service, or a null PDE could not be allocated for the program.
X'18'	The requested program cannot be loaded immediately (insufficient storage); to wait would cause a deadlock.
X'20'	The requested program cannot be loaded immediately due to an I/O error during a load from the dictionary DDLDCLOD area.

The values in a user-defined register and register 1 also contain the following information:

Register n specifies the entry-point address of the loaded program. The register number n is assigned by the EPADDR parameter of the #LOAD statement.
Register 1 specifies the address of the RCE of the loaded program.